DGStrong71 Road Train Member. 1,279. 407. Feb 22, 2013. 70° west. 0. I just got a 2013 Freightliner Cascadia and it has a strange problem. For some reason it will only run off of one fuel tank until that particular tank is refilled and then it stops using that tank and starts using the other and then vice versa. While it is possible to delay the oxidation process by keeping your diesel fuel at cooler temperatures (below 70 degrees Fahrenheit), diesel fuel typically only lasts around 6 to 12 months. As a result, it’s a good idea to be aware of how much diesel you have onsite as well as how long it’s been sitting in the tank. The average lifespan of diesel in a portable fuel tank is around 3-6 months, although this can vary depending on various . One of the most significant affecting the lifespan of diesel in a portable fuel tank is temperature. Diesel fuel is more stable at lower temperatures, so storing it in a cool, dry place can help extend its lifespan. Water is denser than fuel, so in its separated state, it will remain on the bottom of your fuel tank. The continual presence of water can block fuel lines and filters, damage fuel injector tips, lead to corrosion and acid formation, as well as support microbe growth in diesel fuel, making the case for K-100 all the more appealing. Five Gallons Of Diesel Will Last How Long In An Oil Tank? Furthermore, 5-10 gallons of diesel or kerosene will last approximately 1-2 days. Keep this in mind as you decide how much diesel to buy between now and your next kerosene delivery. Consider adding more fuel to your 10-gallon diesel fuel if you have a larger home. This will keep your 1. Remove any excess water sitting in the fuel tank. 2. Change fuel filters that have built up contamination. 3. Use a mobile fuel polishing system to circulate fuel out of the tank, filter the fuel, and return it. 4. Use a biocide or chemicals that kill bacteria and other contaminants. Generally speaking, untreated diesel fuel can last for 6-12 months without degrading significantly. However, untreated diesel fuel can start to degrade in as little as 3 months if it is exposed to high temperatures, humidity, contaminants, or left unaddressed for long periods of time. Using degraded diesel fuel can have several adverse effects on your engine and fuel system. For starters, sludge and sediment can clog filters and injectors, restricting the flow of fuel and leading to poor combustion. Additionally, the corrosion of fuel lines and tanks can result from the acids formed during fuel breakdown and microbial growth GsLIb0.