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.
1993 Ford F-150
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General
I just bought a '92 f-150 XLT is has a "power switch" on the dash. What is that for, it's not in the hand book. Is the XLT two or 4 wheel drive???
1992 Ford F-150 XLT Lariat Extended Cab LB
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General
I think the rear tank is about 10-12 gal & the gas gauge works on it,but I've no ideal what size the front tank is,& the sending unit goes wild when it gets switched over to the front tank.it goes all...
1995 Ford F-150 XL LB
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General
what is the fuel capacity on a 1977 f150 2wd duel tanks
1977 Ford F-150
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General
Can anyone explain to me how the Dual tank fuel system works in a 90 or so model? Thanks.
1990 Ford F-150
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General
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