How long will diesel fuel keep?

Many fuel suppliers recommend that diesel fuel stored for emergency use be replaced with new fuel if not used within a year. The cost of disposing of old fuel, cleaning the tank, and purchasing new fuel is expensive, especially for large aboveground and underground storage tanks. 

As an alternative, CommTank recommends testing fuel to measure it against ASTM standards as specified by the original supplier. If testing reveals contamination, our fuel polishing service can remove microbial growth and the water that supports it.  We re-test the fuel after filtering and polishing, to verify that it meets ASTM specifications.