The most common diesel fuel contaminant is water, often entering through condensation, leaks, or improper refueling, leading to rust, microbial growth (bacteria/fungi), and sludge that clog filters and damage injectors; dirt/debris and microbial growth (bugs) are also major issues, often linked to water contamination. These contaminants severely degrade fuel quality, causing corrosion, abrasive wear, reduced lubrication, and eventual engine failure, especially in sensitive common rail systems.
Some common contaminants found in today's fuels include water, microorganisms, wax, hard particles, debris and other sediments.
Water in diesel fuel poses a particularly challenging threat, especially in large bulk storage tanks. Its presence can be difficult to detect without proper testing, as fuel handling often occurs out of sight. The consequences of water contamination can be costly, leading to significant engine damage.
– The easiest way to ungel diesel fuel is to get the vehicle into a normal temperature zone. You can push it into a heated garage or simply wait for the temperature where your vehicle is parked to rise. The fuel will return to normal naturally.
The most common contaminants found in fuel include:
Put simply, contamination is when there's an undesirable substance present in fuel. If it's not discovered and the fuel is used in machinery, it can cause significant issues and damage mechanisms and, in worst-case scenarios, cause shutdowns. Sometimes the fuel can be treated, sometimes it has to be discarded.
There are four different types of food contamination: chemical, microbial, physical, and allergenic. All food is vulnerable to these four types. Food handlers are legally obligated to ensure the food they prepare and store is free from these contaminants to protect consumers.
The fastest way to ungel diesel fuel involves using a dedicated emergency de-gel additive, applying it to the fuel tank and filling the fuel filter with it, then allowing time for the engine's heat or external gentle heating (like a heat lamp) to circulate the product and melt the wax crystals, effectively restoring fuel flow. Simply adding a general anti-gel to the tank is slower; the key is to get a rescue formula into the filter and lines quickly.
The worst things for a diesel engine involve neglecting maintenance (especially oil/filters), using poor fuel quality, allowing low fuel levels, overloading/lugging the engine, and not letting it warm up/cool down properly, all leading to contamination, excessive wear, turbo damage, and injector/pump failure due to high pressures and sensitive components. Contaminated fuel (water, dirt, high sulfur) is especially damaging, corroding parts and clogging filters in these high-pressure systems.
Idling is ineffective to prevent fuel gelling for multiple reasons, including: Limited fuel circulation: When idling, engines experience limited fuel circulation, resulting in an insufficient blending of warm and cold fuel to raise the temperature throughout the system.
Diesel fuel can only be stored from 6 to 12 months on average — sometimes longer under the best conditions. Generally, to prolong the life of the quality of stored diesel fuel, it should be: Kept cool at around 70 degrees Fahrenheit; Treated with biocides and stabilizers.
These parts help reduce emissions, but they also create restrictions in the engine and exhaust system. Removing them can lead to better airflow, more power, and sometimes even better fuel economy. However, it also means the truck no longer meets emissions standards, which can cause legal issues.
That's because diesel is more dense and oily, meaning that it doesn't evaporate as quickly or easily as regular gasoline. So when minor drips and spills happen at diesel pumps, it drips deep into the pores of concrete, stains right away and attracts extra dust and dirt.
Finally, any water that makes its way through to the fuel injectors reduces the lubrication properties of the diesel fuel along the way. This leads to galling, premature wear, damaged injection tips, and further corrosion of sensitive fuel system mechanical components.
The approximate CO2 per litre of diesel fuel is 2.68kg, and for petrol it is approximately 2.31kg. LPG produces around 1.51kg per litre. There is not much variation in this, even with new vs old vehicles; the main factor that changes it is any unburnt fuel passing through the engine.
Check the diesel tanks. One of the best ways to test for water is to look into your tanks with a flashlight, visually the fuel should be clear and bright. Diesel that has become contaminated with water is darker than usual. Clean diesel is clear and light coloured in appearance.
The "holy grail" of diesel engines typically refers to the Cummins 5.9L 12-valve (6BT) for its legendary reliability, mechanical simplicity (P7100 pump), and immense performance potential, making it iconic in the truck world, while modern contenders for a "holy grail" include the LBZ Duramax for its power and pre-emissions design, and innovative clean diesel tech from companies like Bosch.
But the end is in sight, as the government has declared that sales of petrol and diesel cars will end in 2030. Some car industry observers think this is ambitious, but either way, in a few years, there won't be many diesel cars on sale. They will survive beyond that, but by 2050, they could well be a rarity.
In stark contrast, the 6.4-liter Power Stroke is identified as the most unreliable in his experience. “Out of the 8 6.4 Power Strokes that we've seen, almost every single one of them had catastrophic engine failure.” he reported, adding, “Stay away from the 6.4 Power Stroke.”
What happens if I put too much anti-gel in diesel? Overtreating with an anti-gel can lead to engine clogging or efficiency problems and, depending on the brand, could even void warranties. Still, using just a little more than the recommended amount should not cause issues.
Consider Container and Tank Material
Metal containers are more durable and can withstand higher temperatures than their plastic counterparts. In addition, metal won't warp or deform over time, so it's better for long-term storage.
STAR BRITE Star Tron Tank Cleaner, 1 gallon Treats 500 gallons of fuel – Removes Sludge, Varnish & Other Deposits – Concentrated Formula Works In Gas Tanks & Diesel Tanks. Priced under $40. I have been using Star-Tron fuel additives for years. The enzymes eliminates contaminants and water.
Eight common household pollutants and contaminants
If it's an emergency, call 911. If you believe you or someone you know became ill from eating a certain food, contact your county or city health department. Reporting illnesses to your local health department helps them identify potential outbreaks of foodborne disease.
Cross-contamination is what happens when bacteria or other microorganisms are unintentionally transferred from one object to another. The most common example is the transfer of bacteria between raw and cooked food. This is thought to be the cause of most foodborne infections.