91 Ford F-150 gas dumps from back to front tank but don't......
I am trying to figure our if the switch or pump or
both or neither are bad.... when I put gas in my
back tank some dumps into my front tank us when
the switch is flipped to the front tank my gauge
shows full which the front tank is usually over full
from gas dumping from back tank to front but
when trying to drive on full front tank the car "runs
out" of gas. So basically if I were to fill both tanks
the truck only runs on back tank but dies when
switched to front tank.
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