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. Annual Fuel Quality Test (Mandatory)

• NFPA 110 §8.3.7:
  “A fuel quality test shall be performed at least annually using appropriate ASTM standards.”
• ASTM D975 and related tests are typically used.

1. Documentation Requirements
   Hospitals must maintain:

Generator test logs (monthly, annual, triennial)
Joint Commission surveyors frequently cite missing or undocumented fuel testing as a deficiency.

Annual fuel test results

Corrective actions if fuel fails

Sampling records

Why This Matters for Joint Commission Surveys
Healthcare facilities face overlapping requirements from:

• CMS (federal law)
• Joint Commission (accreditation)
• NFPA 110 (technical standard)
  Fuel quality is one of the most common failure points because hospitals often test generators but not the fuel feeding them.

Action Checklist for Compliance
To be fully compliant for Joint Commission surveys:

1. Perform Annual Fuel Testing

• Use ASTM‑based lab tests
• Document results
• Retain records for survey review

1. Sample Correctly

• Pull samples from the bottom of the tank, not the day tank
• Use proper sampling containers
• Document chain of custody

1. Take Corrective Action if Fuel Fails

• Polish the fuel
• Remove water
• Treat microbial contamination
• Retest and document

1. Keep Records Organized
   Surveyors will ask for:

• Annual fuel test report
• Generator monthly load test logs
• Triennial 4‑hour load test documentation (NFPA 110 §8.4.9.7)

More Information

The post Hospitals and Care Facilities Diesel Fuel Testing 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.

What is Fuel Polishing?

Fuel polishing is a specific, targeted process (often a one-time or periodic service) that involves recirculating (or “polishing”) the fuel through a multi-stage filtration system to remove contaminants. It typically includes:

• Drawing fuel from the bottom of the tank (where water, sludge, sediment, and microbial growth—”diesel bugs”—accumulate).
• Passing it through progressive filters (e.g., coarse to fine, often down to 4 microns or better), water separators, and sometimes coalescers.
• Returning the cleaned fuel to the top of the tank to avoid remixing contaminants.
• The goal is to restore the fuel to meet standards like ASTM D975 (for diesel) by removing water, particulates, microbial biomass, and sometimes reversing oxidation effects.

It’s essentially an advanced cleaning/filtration procedure to salvage contaminated fuel without replacing it. It’s proactive or corrective, often done when fuel has degraded (e.g., dark color, sludge buildup) or as scheduled maintenance (e.g., annually for standby tanks). It’s cheaper, greener, and less disruptive than dumping and replacing the fuel.

What is Fuel Maintenance?

Fuel maintenance is the broader, ongoing program or strategy to keep stored fuel in good condition over time. It encompasses multiple practices to prevent degradation, including:

• Regular fuel polishing (as one key component).
• Fuel testing and sampling (e.g., checking for water, microbes, clarity).
• Adding stabilizers, biocides, or conditioners to prevent oxidation and microbial growth.
• Tank inspections, water draining, filter changes.
• Proper tank design/venting to minimize condensation.
• Monitoring usage and turnover (fresh fuel helps, as does avoiding long stagnation).

In many sources, fuel polishing is described as part of a fuel maintenance program—especially for long-term stored diesel in generators or boats. A good fuel maintenance plan might include periodic polishing sessions, but also preventive steps to reduce how often heavy polishing is needed.

The post What is the difference between Fuel Polishing and Fuel Maintenance? appeared first on Dieselcraft.

1. Corrosion and Rust Water speeds up oxidation on metal surfaces (tanks, lines, pumps, injectors), forming rust. Rust particles become abrasive contaminants that accelerate wear throughout the system.
2. Microbial Growth (“Diesel Bug”) Bacteria, fungi, and yeasts flourish at the water-fuel interface in the tank bottom. They consume diesel hydrocarbons, multiply rapidly, produce acidic byproducts (further corroding components), and form slimy biomass/sludge. This clogs filters and lines, while dead microbes add more particulates.
3. Loss of Lubricity and Increased Wear Diesel provides natural lubrication for high-pressure fuel pumps and injectors. Water dilutes this lubricity, leading to friction, scoring, erosion, cavitation (pitting), spalling, and premature failure—especially in modern common-rail systems.
4. Engine Performance and Combustion Issues
   • Hard starting, rough idling, misfires, stalling, or complete shutdowns (water doesn’t combust properly).
   • Power loss, poor acceleration, reduced fuel efficiency, and higher emissions.
   • In severe cases: Hydro-lock (water in cylinders), injector tip explosion, pump cavitation, or catastrophic damage.
5. Filter Clogging and System Blockages Sludge, biomass, rust, and particulates quickly plug fuel filters, restricting flow and starving the engine of fuel—often leading to sudden failures.
6. Long-Term and Costly Consequences Accelerated wear shortens engine/component life, skyrockets maintenance and repair expenses (e.g., injector or high-pressure pump replacements can run thousands of dollars), and increases downtime risks.

In essence, water doesn’t just sit harmlessly—it creates a snowball effect of degradation, especially in stored, standby, or infrequently used systems (generators, marine vessels, backup tanks, etc.). Prevention is key: Regular fuel maintenance—including water testing, stabilizers/biocides (used judiciously), effective water separators, good tank hygiene, and periodic polishing with tools like your purifier product—removes water early, stabilizes the fuel, and avoids most issues.

https://dieselcraft.com/portable-fuel-polishing/

The post Problems Caused by Water in Diesel Fuel and How to Prevent Them appeared first on Dieselcraft.

Water enters diesel in three primary forms:

• Dissolved (invisible, fully in solution within the fuel).
• Emulsified (tiny suspended droplets that make the fuel appear cloudy or hazy).
• Free (separate liquid layer that settles at the tank bottom, since water is denser than diesel).

Main Sources of Water Contamination

Human Error or Poor Handling Practices Simple oversights like leaving fill caps unsecured, exposing drums or portable tanks to rain, improper storage, or careless refueling can allow direct water entry.

Condensation (by far the most common source) Temperature fluctuations cause fuel tanks to “breathe.” As the fuel and tank cool (e.g., overnight, during seasonal changes, or in varying weather), warm, humid air is drawn in through vents, breathers, or fill pipes. This air cools upon contact with the colder tank walls or fuel surface, reaching its dew point and condensing into liquid water droplets. These droplets accumulate and mix into the fuel. This process is exacerbated in:

Above-ground tanks (greater temperature swings).

Partially filled tanks (larger air space and surface area).

Humid climates or environments with high day-night temperature variations.

Contaminated Fuel from the Supply Chain or Delivery Water can already be present when you receive the fuel. Causes include:

Insufficient settling time at the refinery or during transport.

Shared pipelines or transport systems that introduce moisture.

Contaminated supplier storage tanks. Excess dissolved water may exceed saturation (especially as fuel cools), causing it to “fall out” as free water that settles in your tank.

Leaks or Compromised Tank Integrity External water enters through:

Damaged seals, cracked tanks, faulty vents, loose fill caps, or degraded spill containment.

Rain, snow, pressure washing, groundwater seepage, flooding, or even accidental drainage of collected rainwater into the tank.

Need help? See https://dieselcraft.com/portable-fuel-polishing/

The post How Water Gets Into Diesel appeared first on Dieselcraft.

When biodiesel is poorly made—often referred to as “bad biodiesel”—one of the biggest red flags is a high concentration of glycerine (or glycerin/glycerol). Here’s why that matters:
What Glycerine Is in Biodiesel
• Glycerine is a byproduct of the transesterification process used to make biodiesel from fats or oils.
• Ideally, it should be separated and removed during production.
• If not properly removed, it remains in the fuel as free glycerine or bound glycerides (mono-, di-, or triglycerides).
Why High Glycerine Is a Problem
• Engine Damage: Excess glycerine can clog fuel injectors, form deposits on pistons and valves, and lead to poor combustion.
• Cold Weather Issues: Glycerine solidifies at relatively high temperatures, which can cause fuel gelling and blockages in cold climates.
• Storage Instability: Glycerine can separate out over time, reducing shelf life and causing sediment in tanks.
• Fails Standards: High glycerine levels mean the fuel doesn’t meet ASTM D6751 or EN 14214 standards, making it unsuitable for commercial use.
How It’s Measured
• Standards like ASTM D6584 and EN 14105 use gas chromatography to measure both free and total glycerine in biodiesel.
• Acceptable limits are very low—typically <0.02% for free glycerine and <0.24% for total glycerine in B100 biodiesel.
Can It Be Fixed?
• Yes, but it requires reprocessing or purification, such as:
• Washing the biodiesel to remove impurities
• Vacuum distillation
• Membrane filtration or electrodialysis for crude glycerine recovery
Contact www.dieselcraft.com for a fuel purifier and centrifuge to fix the problem.

MORE INFO

The post Black or Brown Solids in My Diesel Fuel: Causes and Solutions appeared first on Dieselcraft.

The Importance of Fuel Maintenance

The fuel that powers these emergency generators is just as crucial as the generators themselves. Over time, fuel can degrade due to microbial contamination, water accumulation, sediment buildup, and natural aging. If left unchecked, this deterioration can lead to generator failure when it is needed most.

Poor fuel maintenance can cause clogged filters, damaged injectors, corroded fuel systems, and reduced generator performance. In the worst-case scenario, fuel contamination may result in complete generator failure during a critical emergency.

Advantages of Fixed Fuel Polishing Systems

To counter these risks, many hospitals have adopted fixed fuel polishing systems. These systems clean and filter stored fuel, removing contaminants and water to maintain its integrity. The benefits of fuel polishing systems include:

1. Enhanced Reliability: Ensures fuel remains in optimal condition, reducing the risk of generator failure.
2. Extended Equipment Lifespan: Prevents damage caused by degraded fuel, prolonging the life of both the fuel and the generator.
3. Cost Efficiency: Reduces maintenance expenses, prevents costly generator repairs, and extends fuel usability.
4. Regulatory Compliance: Helps hospitals meet fuel maintenance regulations, avoiding potential penalties and ensuring operational readiness.

Risks of Ignoring Fuel Maintenance

Neglecting fuel care can lead to significant consequences, including:

1. Unreliable Backup Power: Degraded fuel increases the risk of generator malfunction or total failure.
2. Higher Operational Costs: Poor fuel management results in expensive repairs, equipment replacement, and potential fines for non-compliance.
3. Patient Safety Hazards: A power failure in a hospital can have life-threatening consequences if essential medical equipment becomes inoperable.

Ensuring Reliable Emergency Power

Proper fuel management requires routine testing, monitoring, and maintenance to ensure high fuel quality and availability. Hospitals must implement robust fuel management protocols to safeguard their critical infrastructure, minimize financial risks, and, most importantly, protect patient lives. In times of crisis, having a well-maintained fuel system can make the difference between seamless medical care and a catastrophic power failure. MORE INFO

The post The Vital Role of Generator Fuel in Hospitals appeared first on Dieselcraft.

Here are the key questions to investigate:

• Is the fuel clear and bright or cloudy?
• Are you using an additive? If so, which one, at what ratio, and how often?
• Is the entire fuel volume cloudy, or only the bottom around the fuel pick-up?

Fuel Sampling Steps

1. Take a sample from the water separator. Is the fuel clear and bright, or cloudy?
2. Take a sample from the top of the fuel tank. Is it clear and bright, or cloudy?
3. Take a sample from the next fuel delivery. Is it clear and bright, or cloudy?

Checking for Overdosing Issues

• Is your supplier providing a winter blend fuel?
• Is the supplier blending the additive? If so, ask for the exact ratio.
• If the fuel supplier overdosed the fuel—or if you added a cold flow improver to an already treated winter blend—you may have caused the issue.
• Water reacts to excessive additives, preventing it from being trapped by a water-blocking filter.

Understanding Additive Ratios

It’s crucial to use the correct amount of additive:

• There are 128 ounces in 1 gallon.
• If an additive treats 1 gallon per 1,000 gallons of fuel, then 1 ounce treats 7.8 gallons.
• Did you add more than the recommended amount? More is not better!

Locating and Removing the Problem Fuel

• Overdosed additives tend to sink to the tank bottom, where the engine’s fuel pick-up is located.
• Take samples from different points in the tank to determine where clear and bright fuel transitions to cloudy.
• Pump off and store the bottom fuel until the water naturally separates over time.

Testing for Contamination

To test fuel clarity, use this method: Diesel Fuel Contamination Test.
If the results are inconclusive, a lab test ($200–$400) may be required—contact us for recommendations.

Conclusion

Diesel fuel additives are a cost-effective way to improve engine performance in cold weather. They enhance cold flow without sacrificing power or performance and don’t reduce lubricity or cetane levels like kerosene.

However, excessive additive use can cause contamination issues. Based on our findings, the fuel was likely delivered with too much winter blend additive or was overdosed during treatment.

The post Troubleshooting Fuel Contamination Issues appeared first on Dieselcraft.