If you’ve been in the fuel business long enough, you’ve heard it before.

A customer calls and says, “We have water in our fuel.”

My favorite reply has always been:

“We don’t sell water.”

It usually gets a laugh. But the conversation that follows is serious. The customer has a problem, and the most recent fuel delivery is often the first thing blamed.

The question is: Where did the water come from?

Without a sample or a test, neither the jobber nor the customer can answer that question with confidence.

Water Can Enter at Several Points

Water can enter a fuel system during transportation, delivery, or storage. It may enter a customer’s tank through a damaged fill cap, a faulty seal, a leaking fitting, or rainwater around an improperly maintained fill point. Water can also separate from fuel as conditions change.

Once water settles at the bottom of a tank, it can remain there until a delivery stirs it up or the fuel level drops low enough for it to reach the pickup. Water in storage systems can contribute to fuel quality problems, microbial growth, and damage to equipment.

That does not mean the delivery is never responsible. A problem can occur anywhere in the handling chain. It means everyone benefits from checking the facts before deciding where the water came from.

A Clean Delivery Can Stir Up an Old Problem

Consider a customer’s storage tank that has accumulated water and sediment over time. The equipment has continued to run, so nobody knows there is a problem.

Then a delivery arrives. Incoming fuel disturbs material at the bottom of the tank. Soon afterward, the customer sees cloudy fuel, plugged filters, or water in a separator.

The timing makes the delivery an obvious suspect. But timing alone does not establish the source. The problem may have been present before delivery, introduced during delivery, or caused by more than one condition.

Testing before and during delivery can help establish what was present at each point.

Test Before There Is a Dispute

A practical fuel quality program does not have to be complicated. A jobber can develop a consistent sampling procedure that fits the operation and customer agreements.

Consider these steps:

1. Check the customer’s tank for bottom water before delivery, where access and the delivery procedure permit. Record the finding.
2. Take a sample of the fuel being delivered using an appropriate sampling point and clean equipment. Label it with the date, location, vehicle or compartment, and delivery information.
3. Inspect or test the sample for water and visible contamination. If a field test shows a concern, follow the test manufacturer’s instructions and arrange further testing when needed.
4. Document any unusual conditions, such as a damaged fill cap, standing water around the fill point, or water detected in the tank before delivery.
5. Retain samples according to company policy, using suitable containers, safe storage, and a documented chain of custody if a dispute is possible.

An industry storage guide recommends checking tank-bottom water before and after delivery. Clean sampling equipment and appropriate sample locations also matter: a bottom sample can help identify accumulated water and sediment, while a representative delivery sample helps assess the fuel being transferred. transportationenergy.org

A sample is only useful if it is collected and handled properly. A clear-looking sample is encouraging, but appearance alone cannot rule out every fuel quality problem.

What to Do When a Customer Calls

When a customer reports water in the fuel, the best first response is to listen and gather information.

Ask:

• When was the water first discovered?
• Was it found in the storage tank, a vehicle separator, or a filter?
• When was the tank last checked for water?
• Have other vehicles or pieces of equipment been affected?
• Is there a retained delivery sample?
• Can the customer’s tank be sampled safely before anything is removed or treated?

If there is a significant amount of water or equipment is being damaged, the customer should stop drawing from the affected system until the situation can be evaluated. Preserve relevant samples and records, and use an independent laboratory when the cause or extent of contamination is in dispute.

The goal is to solve the customer’s problem while establishing what the evidence shows.

Make Fuel Testing Part of Customer Service

Fuel jobbers do more than deliver gallons. They help customers keep trucks, generators, construction equipment, and other diesel-powered operations running.

Offering a simple fuel testing program can start a useful conversation about tank maintenance. For customers with storage tanks, periodic checks for water, visible contamination, and microbial activity can reveal problems before they interrupt operations.

Dieselcraft offers fuel test kits that can help identify signs of fuel contamination in the field. Testing can be part of a broader program that includes sampling, water removal, tank inspection, and fuel polishing when appropriate.

The Best Answer Is a Test Result

“We don’t sell water” may be a good opening line, but the strongest response is a documented fuel sample and a consistent delivery procedure.

When a customer calls with a complaint, both parties want the same thing: a reliable answer and a solution.

Test the fuel. Document the delivery. Help the customer find the source.

Meta description: Fuel jobbers often get blamed when customers find water in diesel fuel. Learn how sampling, testing, and delivery records can help identify the source and resolve complaints.

The post Fuel Jobbers: Who Gets Blamed for Water in Diesel Fuel? appeared first on Dieselcraft.

Cloudy fuel does not always mean water contamination. Water droplets, cold-weather wax, fine dirt, and aging fuel can all cause haze. Testing helps you choose the right treatment.

Water can appear in fuel in three forms:

• Suspended or emulsified water: Tiny droplets mixed throughout the fuel. They may make it cloudy or milky.
• Dissolved water: Water held within the fuel that you generally cannot see.
• Free water: Water that has separated and collected at the bottom.

Check a Fuel Sample

1. Collect a sample using a Dieselcraft FCT-100 Test Kit. Note the fuel temperature and inspect the sample before shaking. Take a separate sample from the tank bottom to check for collected water.
2. Let it stand undisturbed for several hours or overnight. Do not add the water-detection capsule during this observation period. Photograph the sample at the start and again after settling.
3. Look for changes. A water layer forming at the bottom shows that droplets are separating. If the fuel stays cloudy, the cause could be water droplets that resist settling, wax, or fine particles.
4. Use the water-detection capsule according to the kit instructions. It checks for water but does not, by itself, prove that the water is emulsified.
5. If the cause remains unclear, ask a fuel laboratory to investigate. Karl Fischer testing measures water content, but that number alone does not tell you whether the water is dissolved or present as droplets.

Suspended Water or an Emulsion?

These terms overlap. Both describe water droplets mixed into fuel.

The practical difference is how easily the droplets separate. Droplets that settle readily form an unstable mixture. Droplets that remain mixed for a long time form a more stable emulsion. Settling time and temperature affect what you observe.

How Can the Water Be Removed?

Dieselcraft fuel-polishing equipment can separate suspended water when operated at the appropriate flow rate and conditions. Before-and-after testing verifies the results. Truly dissolved water requires a different treatment.

Some stubborn emulsions may benefit from a demulsifier—an additive that helps small water droplets join together so they can settle or be separated. Chemicals are not always necessary.

Stanadyne Performance Formula contains water demulsifiers, but its effectiveness depends on the fuel and the emulsion. Confirm compatibility with your fuel, especially R99, and test a small sample at the recommended dose before treating the tank. Available at: https://link.amazon/B0eBHR88L

After treatment, the separated water must still be drained or removed. Avoid additives designed to keep water mixed into the fuel when your goal is separation.

For help with fuel testing and polishing equipment, contact Dieselcraft at 530-613-2150 or visit dieselcraft.com.

The post Cloudy Diesel Fuel: Water, Emulsions & Testing | Dieselcraft appeared first on Dieselcraft.

R99 renewable diesel holds much less dissolved water than FAME biodiesel. Mixing these fuels changes how the finished blend handles water, cold temperatures, and storage.

Commercially formulated blends can perform well when they meet fuel specifications and engine requirements. However, mixing unknown fuels in a storage tank can create an unpredictable product—and blending should never be used as a substitute for removing water.

R99 and FAME Are Different Fuels

R99 renewable diesel is a hydrocarbon fuel commonly manufactured by hydrotreating renewable feedstocks. Its chemistry resembles petroleum diesel.

FAME—fatty acid methyl esters—is conventional biodiesel. It has a different chemical structure and is commonly sold in blends such as B5 or B20. B20 contains 20% FAME biodiesel; the remaining portion can include petroleum diesel or renewable diesel.

The U.S. Department of Energy distinguishes renewable diesel, which meets ASTM D975, from biodiesel blendstock, which meets ASTM D6751. The finished blend must meet the applicable specification.

Which Fuel Holds More Water?

FAME holds substantially more dissolved water than R99 at the same temperature. As FAME content increases, the blend generally gains the ability to keep more water dissolved.

One NREL study measured water-saturation values of approximately 85 ppm for the tested renewable diesel and 1,567 ppm for the tested B100 FAME. These are examples from specific samples, not universal limits. Fuel composition and temperature affect the actual saturation point.

Greater water-holding capacity does not mean better fuel quality. It means more water can remain present without forming a visible layer.

Clear Fuel Can Still Contain Water

Water occurs in fuel in three forms:

• Dissolved water: Water distributed at the molecular level. The fuel may look clear.
• Suspended or emulsified water: Small droplets dispersed through the fuel, sometimes producing haze.
• Free water: Separated water that typically collects at the tank bottom.

A Karl Fischer test measures water in the tested sample. It does not, by itself, identify how much was dissolved and how much was present as droplets. Representative sampling is essential.

For example, 225 ppm by weight equals 0.0225% water. That result alone does not establish the FAME percentage, prove that all water is dissolved, or determine whether the fuel meets every applicable requirement.

Why Avoid Uncontrolled Blending?

1. Water Can Separate After Mixing

When a FAME-containing fuel is diluted with R99, the resulting blend may hold less dissolved water than the original fuel. If the water content exceeds the new blend’s saturation limit, some water can separate into droplets.

Cooling can also reduce water solubility. Fuel that appears clear during delivery may develop water haze or separated water after conditions change.

This separation is not inevitable. It depends on the starting water content, temperature, and final composition.

2. Adding FAME Does Not Remove Water

Adding FAME may allow more water to remain dissolved. The fuel could appear clearer while still containing the same water.

Making water less visible is not water removal. Adding dry fuel can lower the measured concentration through dilution, but it does not extract the water already in the tank.

3. Cold-Weather Performance Can Change

Adding FAME to a suitable winter-grade R99 can raise the blend’s cloud point. Depending on the feedstock and concentration, crystals may form at temperatures where the original R99 would remain usable.

The cold-weather performance of the finished mixture must be established rather than assumed from either component.

4. Storage Stability Can Change

FAME can reduce a blend’s resistance to oxidation. As fuel ages, oxidation can contribute to acids, gums, and deposits.

This matters for standby generators and other equipment where fuel remains in storage for extended periods. Mixing a fresh delivery with old fuel does not establish that the resulting mixture is suitable for continued storage.

5. The Final Blend May Exceed Equipment Requirements

FAME can improve lubricity, but it also changes density, viscosity, and evaporation characteristics. These changes become more significant at higher blend levels.

An engine approved for R99 is not automatically approved for every R99/FAME mixture. Confirm the allowable biodiesel percentage and finished-fuel requirements with the equipment manufacturer.

Can Fuel Polishing Fix the Problem?

Fuel polishing can remove solids and, with suitable equipment, free and dispersed water. Ordinary particle filtration, settling, and centrifuging do not directly remove truly dissolved water.

Reducing dissolved water requires an appropriate drying process, such as fuel-compatible vacuum dehydration or a properly selected adsorbent system. Polishing also cannot reverse chemical degradation caused by oxidation.

Water-block filters serve a different purpose. Cim-Tek describes Hydrosorb primarily as a water-alert filter that restricts flow when excess water is detected. It should not be assumed to dry fuel to a specified ppm level.

Know What Is Going Into Your Tank

Before combining deliveries, confirm the fuel type, FAME percentage, water condition, and equipment requirements. Check a separate tank-bottom sample for accumulated water, and use laboratory testing when precise measurements are needed.

Avoid blending unknown fuels to correct contamination. Identify the problem, remove the contamination, and verify the finished fuel. A controlled, documented blend is different from mixing whatever fuel happens to be available.

Dieselcraft helps operators assess contamination and select practical fuel-testing and polishing equipment.

Call 530-613-2150 or visit dieselcraft.com.

The post R99 vs. Biodiesel Blends: Water Retention, Blending Risks & Fuel Care | Dieselcraft appeared first on Dieselcraft.

Contaminated diesel does not automatically need to be discarded. But fuel polishing cannot fix every problem.

The right decision depends on the fuel’s condition, the type of contamination, and the total cost of getting your tank back into service.

Before paying to replace an entire tank—or attempting to salvage it—find out what you are dealing with.

Start With Testing

A cloudy sample, sludge in the tank, or repeated filter plugging tells you something needs attention. It does not tell you whether the fuel can be recovered.

Take representative samples, including the tank bottom. A sample from the upper portion may miss settled water and debris.

Initial checks can screen for water, visible contamination, and microbial activity. When chemical deterioration or contamination by another fluid is suspected, laboratory testing helps determine whether the fuel remains suitable for its intended use.

Test first. Choose the treatment second.

When Fuel Polishing Makes Sense

Fuel polishing is worth considering when the diesel remains chemically suitable for use but contains removable contamination.

Examples include:

• Free water accumulated at the tank bottom.
• Suspended dirt, rust, and sediment.
• Contaminated material contributing to recurring filter plugging.

A properly selected system circulates the fuel through equipment designed to separate water and remove solids. Its effectiveness depends on the contamination, equipment capabilities, tank access, and operating conditions.

For microbial contamination, polishing may be part of the corrective process. Water removal, appropriate treatment, and removal of contaminated deposits may also be necessary.

Ask what the system removes and how testing will verify the results.

When Replacement Makes More Sense

Replacement may be the better choice when testing shows that the fuel is unsuitable and the proposed treatment cannot correct the problem.

Examples include fuel that has significantly deteriorated or has been mixed with an incompatible fluid.

If gasoline, DEF, solvents, or another unknown substance has entered the tank, do not assume ordinary filtration will make it usable. Identify the contaminant and obtain an appropriate assessment before returning the fuel to service.

A small quantity of questionable fuel may also cost more to investigate and treat than to replace.

Compare the Complete Costs

The comparison should include more than the price of polishing versus the price of new diesel.

Tank cleaning can be necessary with either option. Filling a dirty tank with new fuel leaves the contamination source in place.

For facilities with several tanks or recurring maintenance needs, owning portable fuel polishing equipment may spread the investment across multiple applications. For an isolated problem involving a small tank, replacement may be more economical.

Correct the Source of Contamination

Whether you polish or replace the fuel, investigate how the problem developed.

Check delivery quality, fill caps, seals, vents, water accumulation, and tank maintenance practices. Keep records of sampling, treatment, and filter changes.

Without correcting the source, the same problem can return.

Verify Before Returning the Fuel to Service

Clearer fuel is a useful observation, but appearance alone does not establish that it meets the required fuel specification.

After treatment, retest for the original problem. If broader fuel quality was in question, use the appropriate laboratory tests before returning it to service.

The goal is dependable fuel—not simply a cleaner-looking sample.

Discuss Your Tank With Dieselcraft

Tell us how much fuel you have, what equipment it supplies, and what your samples show. Dieselcraft can help you discuss testing and portable fuel polishing options for your application.

Dieselcraft Fluid Engineering
John: 530-613-2150

Explore Portable Fuel Polishing Systems
View Diesel Fuel Test Kits

The post Fuel Polishing vs. Fuel Replacement: Which Makes Sense? appeared first on Dieselcraft.

Your tank may be full, but is the fuel ready to do its job?

Diesel stored for standby generators, farm equipment, boats, and fleet operations needs regular attention. Water and contaminants can accumulate while the equipment sits idle. Problems may only become apparent when filters plug or an engine struggles to run.

Watch for these five warning signs—and investigate before contaminated fuel reaches your equipment.

1. Water at the Bottom of the Tank

Water can enter through contaminated deliveries, damaged seals, leaking fittings, or condensation. Free water settles beneath diesel, so a sample taken only from the upper portion of the tank may miss it.

Look for a separate bottom layer in a sample, repeated water-separator alarms, or water collected during tank-bottom checks. Water in storage tanks is a common fuel-management problem.

What to do: Check the tank bottom using an appropriate sampling method and water-detection test. Remove accumulated water and investigate how it entered. A clear-looking sample from the top does not establish that the entire tank is water-free.

2. Sludge or Sediment in Fuel Samples

Visible debris, sticky deposits, or sediment collecting at the bottom of a sample jar deserve attention. Material entering with deliveries or accumulating inside the tank can eventually reach the fuel pickup.

Sediment can obstruct fuel flow and plug filters. Changing the filter addresses the immediate restriction, but leaves the source in the tank.

What to do: Compare samples from different tank depths. Determine whether the contamination is suspended in the fuel or concentrated at the bottom. Heavy deposits may require tank cleaning as well as fuel treatment.

3. Slime or Suspected Microbial Growth

The problem often called “diesel algae” usually involves bacteria and fungi. These microorganisms can grow where water and fuel meet. Slime and recurring deposits may be warning signs, but appearance alone cannot identify microbial contamination.

What to do: Test for microbial contamination before choosing treatment. Address the water that supports growth, and arrange removal of contaminated material. If a biocide is needed, use a product approved for the application and follow its label.

4. Cloudy or Hazy Fuel

A cloudy sample is a reason to investigate. Possible causes include suspended water, fine contamination, or wax crystals forming as fuel cools. Cold-weather cloudiness therefore needs a different diagnosis from water contamination.

What to do: Record the sample temperature and use suitable tests to determine the cause. Avoid adding a chemical simply because the fuel looks cloudy.

A visual check is a useful first step. It cannot establish every aspect of fuel quality.

5. Filters Plugging More Often Than Usual

Shortening filter life is an early warning that deserves investigation. It may appear as reduced dispensing flow, increased filter restriction, or repeated engine fuel-filter replacement.

Premature plugging can signal contaminated fuel, while microbial contamination can also contribute to filter blockage.

What to do: Keep records of filter changes and inspect removed filters. Sample the storage tank and check recent deliveries. Find the source instead of accepting frequent filter replacement as normal.

Can Fuel Polishing Help?

Fuel polishing circulates stored fuel through equipment designed to remove specific contaminants, such as water and solid debris.

The right treatment depends on what testing finds. Before selecting a system, ask:

• What contaminants does it remove?
• Does it remove free water, emulsified water, or both?
• Can it reach contamination near the tank bottom?
• What testing will verify the results?

Fuel polishing does not automatically correct every fuel problem. If another liquid has entered the tank or the fuel has chemically degraded, further analysis may be needed before deciding whether treatment or replacement makes sense.

Cleaner-looking fuel is encouraging. Verified results are what matter.

Check Your Fuel Before You Need It

Start with representative samples, investigate contamination, and correct the source. After treatment, retest to confirm the improvement.

Dieselcraft offers fuel test kits and portable fuel polishing systems to help you manage stored diesel fuel. Tell us your tank size, application, and what your samples show so we can discuss the next step.

Dieselcraft Fluid Engineering
Call John: 530-613-2150
Explore Dieselcraft Fuel Test Kits
Learn About Portable Fuel Polishing

The post Stored Diesel Fuel: 5 Contamination Warning Signs | Dieselcraft appeared first on Dieselcraft.

Diesel Fuel Testing for Construction Equipment

The fastest, cheapest way to stop fuel-related breakdowns on the job site

Construction equipment fails for one main reason: contaminated diesel. Water, sludge, and microbial growth destroy injectors, plug filters, and shut down machines right when production is at its peak. That’s why more construction fleets are using Dieselcraft Fuel Test Kits — the fastest way to know if your diesel is safe to run before it costs you thousands in downtime.

Why Construction Fleets Need Dieselcraft Fuel Test Kits

Job-site fuel tanks, slip tanks, and machine tanks all face the same problems:

• Water from condensation
• Microbial growth (“diesel bug”)
• Sludge stirred up by vibration
• Dust and dirt entering during refueling
• Diesel that sits too long and degrades

A Dieselcraft test kit identifies these issues in minutes, right in the field, with no lab and no waiting.

The Real Cost of Not Testing Fuel

One bad tank of diesel can cause:

• Early filter plugging
• Loss of power under load
• Injector and pump failures
• Hard starts and stalling
• Missed deadlines and rental penalties

A single repair can cost $2,000–$8,000. A Dieselcraft test costs a few dollars.

What Dieselcraft Fuel Test Kits Detect

Dieselcraft kits are engineered for construction environments and reveal:

• Water contamination — the #1 cause of injector failure
• Sludge and particulates — stirred up by rough terrain
• Microbial growth — common in warm, wet tanks
• Fuel degradation — dark, unstable, or oxidized diesel

If your equipment sits between jobs or runs from job-site tanks, these problems are guaranteed to show up eventually.

Perfect for All Construction Equipment

Dieselcraft test kits are used on:

• Excavators
• Skid steers
• Dozers
• Wheel loaders
• Backhoes
• Telehandlers
• Job-site generators
• Light towers
• Fuel storage tanks

Simple, Fast, Field-Ready

• No lab required
• No special training
• Clear pass/fail results
• Works in minutes
• Small enough to keep in every service truck

Your crew gets answers immediately — not after the machine fails.

Make the Right Call Every Time

A Dieselcraft test kit tells you exactly what to do:

• Fuel passes — run it
• Borderline — polish or filter it
• Fails — clean the tank or replace the fuel

No guessing. No downtime. No expensive surprises.

Bottom Line

Dieselcraft Fuel Test Kits are the most cost-effective way to protect construction equipment from fuel-related failures. With equipment costs rising and schedules tighter than ever, testing diesel before you run it isn’t optional — it’s essential.

Dieselcraft gives construction fleets the confidence to run hard, stay productive, and avoid costly breakdowns caused by contaminated fuel.

The post Diesel Fuel Testing for Construction Equipment | Dieselcraft Fuel Test Kits appeared first on Dieselcraft.

Yes. Old diesel fuel can oxidize, form sludge, collect water contamination, and restrict fuel flow. These problems increase injector return fuel temperatures and can trigger high fuel temperature alarms on generators and diesel engines.

How long can diesel fuel be stored before it goes bad?

Untreated diesel fuel may begin degrading within 6–12 months. Properly stabilized diesel can sometimes last 18–24 months, but fuel older than 2 years should always be tested for oxidation, water contamination, sludge, and microbial growth.

What diesel fuel tests should I run on old fuel?

Recommended tests include:

• ASTM D2709 Water & Sediment Test
• ASTM D2274 Oxidation Stability Test
• Microbial Contamination Testing
• ISO 4406 Particle Count Analysis
• Cetane & Lubricity Testing

Can diesel additives restore degraded fuel?

No. Additives may improve lubricity and anti-gel performance, but they do not remove sludge, water, oxidation byproducts, or microbial contamination from old diesel fuel.

What are signs of contaminated diesel fuel?

Common symptoms include:

• High fuel temperature alarms
• Frequent fuel filter plugging
• Dark or cloudy diesel fuel
• Black slime inside tanks
• Hard starting generators
• Injector noise
• Generator shutdown under load
• Water separator alarms

What causes diesel sludge in storage tanks?

Diesel sludge forms from oxidation, microbial contamination, water intrusion, and long-term fuel degradation. Sludge typically settles at the bottom of belly tanks and bulk storage tanks.

Can microbial growth damage diesel injectors?

Yes. Bacteria and fungal growth create acids, sludge, and biomass that clog filters, corrode tanks, and reduce injector lubrication, potentially leading to injector overheating and failure.

How do I check for water in diesel fuel?

Water contamination is commonly identified using ASTM D2709 testing or by pulling a bottom tank sample from the lowest point in the tank. Visible separation, haze, or slime may indicate water contamination.

What is fuel polishing?

Fuel polishing is a process that circulates diesel fuel through specialized filtration and water separation equipment to remove sludge, particulate contamination, microbial growth, and free water from storage tanks.

How often should standby generator fuel be tested?

Most generator fuel should be tested annually. Critical emergency power systems often require regular fuel polishing and contamination monitoring to maintain fuel quality and prevent downtime.

Can clogged fuel filters cause high fuel temperatures?

Yes. Restricted fuel flow caused by clogged filters forces fuel systems to recirculate heated fuel, increasing return fuel temperature and potentially triggering alarms.

Does fuel polishing restore old diesel fuel?

Fuel polishing can significantly improve fuel quality by removing contamination, sludge, water, and particulates. However, severely oxidized fuel may still require partial replacement depending on laboratory test results.

Why do belly tanks develop contamination?

Belly tanks often collect condensation due to temperature swings and low fuel turnover. Water accumulation promotes oxidation and microbial growth, leading to sludge buildup over time.

Can oxidized diesel fuel damage injector pumps?

Yes. Oxidized diesel loses lubricity and forms varnish deposits that increase injector pump wear, friction, and internal heating.

What should I do if my diesel fuel is over 2 years old?

You should:

• Pull a bottom tank sample
• Test for water and sediment
• Check for microbial growth
• Run oxidation stability testing
• Inspect and replace fuel filters
• Consider fuel polishing before operating critical equipment

The post Frequently Asked Questions About Old Diesel Fuel & High Fuel Temperature Warnings appeared first on Dieselcraft.

Hydrophilic coalescer membranes do attract water and allow diesel to pass, causing droplets to merge and fall out by gravity.

But they only remove free and emulsified water — not dissolved water.

The widely advertised “99.99% water removal” is a marketing claim, not a field verified spec.

Actual published data shows:

•             99.5% single pass removal at 5 microns

•             Efficiency drops sharply with:

•             Biodiesel blends (B20 holds 3–4× more dissolved water than B5)

•             Surfactants in ULSD and additives

•             Microbial byproducts

•             High solids loads

Because biodiesel is hygroscopic and modern diesel contains surfactants, 99.99% is only achievable in ideal lab fuel, not real world diesel.

Why Dieselcraft Outperforms Coalescers

Proprietary Media (Unique Advantage)

Dieselcraft is the only purifier using a proprietary media bed engineered to:

•             Break water out of suspension

•             Capture heavy solids

•             Stabilize flow

•             Increase separation efficiency

This media:

•             Is not a filter

•             Does not plug

•             Never needs replacement

No coalescer or filter system offers an equivalent mechanism.

Immune to Coalescer Failure Modes

Coalescers fail when exposed to:

•             Surfactants in ULSD

•             Biodiesel blends

•             Additives

•             Microbial growth

•             High particulate loads

Dieselcraft’s purifier is unaffected by all of these.

It maintains performance in real‑world diesel, not just clean test fuel.

Consistent, Long Term Performance

Coalescers degrade as:

•             Elements load

•             Membranes saturate

•             Flow changes

•             Additives reduce coalescing

Dieselcraft remains stable because:

•             No media to saturate

•             No element to plug

•             No chemical sensitivity

•             No flow dependent coalescing behavior

It performs the same on day 1 and day 1,000.

Bottom Line

The Dieselcraft Fuel Purifier is superior because it is:

•             Filter less

•             Low maintenance

•             Highly efficient

•             Unaffected by modern diesel chemistry

•             Designed for realm world contamination

•             Proven to reduce engine wear and extend service intervals

It is the only purifier combining mechanical separation with a proprietary media bed, delivering unmatched reliability and performance. MORE INFO

The post Coalescer Technology: What Works and What Fails in the Field appeared first on Dieselcraft.

1. Emulsifiers / Dispersants (“Water Removers”)

These break water into microscopic droplets and suspend them in the fuel. The water then passes through the system and is burned off as vapor.

Pros: Good for small amounts of water, prevents icing, avoids visible free water.

Cons: Doesn’t eliminate water—just sends it to the engine. Too much can cause wear or corrosion. Not ideal for modern high‑pressure systems.

2. Demulsifiers (Preferred for Storage Tanks)

These cause water droplets to combine and settle at the bottom as free water.

Pros: Enables true removal via drains, separators, or polishing. Reduces corrosion and microbial growth.

Cons: Requires a way to physically remove the separated water.

Key Points

•             No additive destroys or converts water; claims otherwise are marketing.

•             Best practice: Use demulsifiers + mechanical removal (drains, separators, polishing).

•             For stored diesel: choose demulsifiers and remove water regularly; avoid strong emulsifiers in bulk tanks without drainage

MORE INFORMATION

The post Why Chemical Fuel Additives Don’t Remove Water from Diesel appeared first on Dieselcraft.

What It Is

• A water‑absorbing insert designed for diesel tanks in vehicles, generators, boats, RVs, farm equipment, and storage tanks.
• Typically shaped like a pouch, sock, or small cylinder.
• Made from super‑absorbent polymers that selectively absorb water — not diesel fuel.
• Includes a retrieval cord so it can be easily removed and inspected.
• Must be checked periodically and replaced once saturated.

How It Works
Water naturally accumulates in diesel tanks through:

• Condensation
• Contaminated fuel deliveries
• Long‑term storage
  Once placed in the tank:

1. The absorber sinks to the bottom where water collects.
2. It pulls in and traps free water molecules.
3. When it reaches its rated capacity (e.g., 7.2 oz), it stops absorbing.
4. You remove it, discard it, and replace it with a fresh one.

Why It Matters
Water in diesel can lead to:

• Injector damage
• Microbial growth (“diesel algae”)
• Rust and corrosion inside tanks
• Hard starts, rough running, or power loss
• Fuel filter clogging
  A water absorber helps prevent these issues without adding chemicals to your fuel.

Typical Use Cases

• Long‑term storage tanks
• Backup generators
• Boats and RVs
• Farm equipment
• Diesel trucks that sit unused for extended periods

How to Use It

1. Drop the absorber into the tank through the filler neck.
2. Make sure the retrieval cord stays accessible.
3. Leave it in place during storage or operation.
4. Check periodically and replace when saturated.

More info at

The post Diesel Tank Water Absorbers: Protect Your Fuel and Engine appeared first on Dieselcraft.