Diesel fuel will not remain fresh forever. Without proper additives diesel fuel can be stored safely for up to two years, meaning that if you have a diesel car in storage, you will eventually need to add these additives. Diesel fuel is a carbon-based petrochemical. If left for a long period of time, the diesel will begin to oxidize, causing hydrocarbons to react with oxygen in the tank. This creates deposits that can damage fuel lines, carburetors, and other system components. Therefore, storage for longer than 30 days requires additives, specifically fuel stabilizers. These additives are recommended for storage of not only your diesel car but also anyother vehicles or pieces of equipment that are not used frequently. Remember to keep all fuel tanks full for long-term or seasonal storage, as a full tank helps prevent condensation. Bare interior tank walls will create a condition of condensation as there is air in the tank and water in the air.
Like gasoline, diesel fuel is also subject to damage without proper storage, perhaps even more so. Because diesel systems are designed differently from gasoline systems, they require a completely different stabilizer.
During storage, diesel fuel can attract moisture, which promotes growth of algae, fungus, and bacteria. In 2006, the Environmental Protection Agency (EPA) mandated that diesel fuel contain less sulfur than previous incarnations. As an environmentally-friendly measure, it was designed to create less sulfur in the air and therefore contribute to better air quality. It nonetheless made diesel fuel less stable and more likely to cause trouble without proper fuel additives. Overgrowth of bacteria, fungus, and algae gums fuel and fuel lines, causing diesel engines to run poorly, assuming they run at all. Another issue concerning diesel engines is thermal oxidation, or when fuel re-circulates throughout the engine and heats up. “Thermally stressed” fuel can result in sludge and sedimentforming in the tank due to pressure and heat.
Use Diesel Formula STA-BIL® whenever you put your diesel fuel car in storage, specifically 1 ounce for every 10 gallons of fuel. This will keep the fuel fresh for up to 1 year. If you need it to go for longer than the year, you can add a double or even a triple dosage, two add two to three years respectively.
It is essential to keep fuel systems clean and particle-free, i.e. “good housekeeping.” Dry storage conditions for the best classic cars and all vehicles are also necessary. This prevents vehicles from being exposed to high humidity, which can result in rust. As previously mentioned, it also helps prevent too much water in the fuel tank, which results in condensation in the fuel tank and the rest of the vehicle. You can store diesel fuel for longer periods of time with stabilizers.
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