Just bought a 1993 f-150 has dual fuel tanks, which one should I use?
Typically ppl will use the front tank most since its the larger one and have the rear tank as a reserve. If they both work properly and you keep fuel in the off tank to prevent corrosion it is just a personal preference. Do use your off tank from time to time to keep the in tank pump from binding due to age.
I would use both so that you have fresh fuel in both tanks.
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