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/

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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.

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1. Dirt and Dust: Dirt and dust can enter the engine through the air intake system, leading to abrasion of engine components such as piston rings, cylinder walls, and valves. This can result in increased friction, reduced compression, and decreased engine efficiency.
2. Water: Water can cause serious damage to engines, particularly in diesel engines where water contamination can lead to injector and fuel pump damage. Water can also cause corrosion of metal components, leading to premature wear and failure.
3. Fuel Contaminants: Contaminants in fuel such as dirt, rust, and water can clog fuel filters, injectors, and fuel lines, leading to poor engine performance, rough idling, and decreased fuel efficiency. In severe cases, fuel contamination can cause engine stalling or failure to start.
4. Oil Contaminants: Contaminants in engine oil, such as dirt, metal particles, and sludge, can accelerate wear on engine components, reduce lubrication effectiveness, and cause overheating. This can lead to increased friction, premature component failure, and costly repairs.
5. Coolant Contaminants: Contaminants in engine coolant, such as dirt, rust, and air bubbles, can lead to corrosion of cooling system components, blockages in the radiator and hoses, and decreased heat transfer efficiency. This can result in engine overheating, coolant leaks, and potential engine damage.
6. Exhaust Contaminants: Exhaust contaminants such as carbon deposits, sulfur, and nitrogen oxides can accumulate in the exhaust system, leading to restricted airflow, increased back pressure, and reduced engine performance. Additionally, emissions of harmful pollutants can lead to environmental concerns and regulatory issues.
7. Combustion Chamber Contaminants: Contaminants in the combustion chamber, such as carbon deposits and oil residue, can interfere with the air-fuel mixture, combustion process, and exhaust gas flow. This can result in reduced power output, increased fuel consumption, and elevated emissions levels.

To mitigate the impact of contaminants on engine performance, regular maintenance is essential. This includes changing air, fuel, and oil filters at recommended intervals, using high-quality fuel and lubricants, flushing and replacing coolant as needed, and performing periodic inspections and cleaning of engine components. Additionally, proper storage and handling of fuel, oil, and coolant can help prevent contamination before it reaches the engine.

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Contact Dieselcraft to solve any contamination problem you have. Call or text 530 613 2150 Email sales@dieselcraft.com

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1. Cleaner oil, GUARANTEED.

2. 30-50% longer oil life. This means cost of oil changes goes down by at least 30%. The cost of oil is going UP. Your $250 change today may be $350 soon.

3. Longer full-flow filter life.

4. Longer service intervals.

5. Reduces engine wear up to 50%.

6. Long-term preventative maintenance.

7. Reduced maintenance costs… If you cut oil changes by 33% how much do you save?

8. Cuts waste disposal costs. A centrifuge is permanent, cleanable and reusable.

9. Improves your regulatory compliance by protecting the environment.

10. No media or filter elements to replace.

11. Reduces total cost of ownership.

12. Helps ensure clean combustion and fuel efficiency.

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Otherwise, the next best place is going to be where the vacuum pump is located and the pump itself will have to be relocated.  That is probably not as big of a chore as it sounds though.  It’s just up to the owner, and no matter how big the chore seems, just keep reminding yourself that a new long block from Ford for this truck is about 19,000.00 (before labor).  That would be a tragedy since it is really a good engine if taken care of properly.  I am a 6.4 Power Stroke enthusiast and I know this kit will pay for itself in a short amount of time and filter better than any of the non-spinner competitors can.

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A lot of people wee fooled for a long time.

Relatively clear fuel but clogged filters after 2,000 mile in a Class 8 Truck.

The problem was constant filter clogging with a black colored material.

Generally if it is a fuel tank with a black film clogging filters we assume it is bacteria so we recommend a tank cleaning additive.

They used an additive, but the problem did not go away.

We asked for photos.

Clear fuel but filters were clogged with the mystery black material.

The filter and fuel sample were sent to a lab for answers. No bacteria was found.

We again gave our best guess, could it be rubber. Some fuel blends with high amounts of biodiesel are not so friendly with some rubber hoses. The fuel eats up the hose from the inside out and causes a similar black substance that plugs filters.

Again back we go to the lab to identify the culprit.

The tank was drained, washed and this residue was found. It was send to a lab for identification.

No it’s not rubber it is soot from the engine. The engine has 5 of 6 bad fuel injector seals and this was sending engine soot back down the return line to the fuel tank. So as we cleaned the fuel and the tanks, the engine was creating the problem as the engine was running.

To self test filter plugging mysteries take a sample of the sludge and mix it with as small amount of Xylene.

Xylene is as synthetic paint thinner available at the hardware store. This should dissolve any biomass sludge if the problem is bacteria. If it does not, rinse in warm soapy water and rub the material between your fingers. Feel gritty? Could be soot or does it feel like rubber?

BUY HERE

Have less than 100 gallons of fuel and need a quick and simple way to get the water and large solids out?

BUY HERE

The post Clogged Fuel Filters? Here’s Why They Don’t Solve the Problem appeared first on Dieselcraft.

Water Contamination
Even small amounts of water in diesel can crack injectors, corrode fuel lines, and reduce combustion efficiency. Sources include biodiesel blends, condensation, rain, and poorly maintained storage tanks.

Microbial Growth and Sludge
Bacteria in fuel (“fuel bugs”) produce bio-mass sludge that clogs filters and reduces engine performance. Mislabeling this as “algae” is a common error.

Fuel Degradation
Diesel begins breaking down within 30 days of refining, forming dark deposits that foul systems and shorten engine life.

Solutions: Prevention and Treatment

• Fuel additives: Improve combustion, lubricity, cold flow, and cetane rating
• Water removal: Drain tanks, use separators
• Fuel polishing: Circulate and filter fuel regularly to remove contaminants
• Testing: Identify water or microbial contamination early using fuel test kits

Conclusion
Up to 80% of diesel engine failures are linked to poor fuel quality. Regular testing, proper storage, and treatment with additives and fuel polishing are the best ways to protect your engine, extend component life, and prevent costly downtime. BUY HERE

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