Question:

1989 f-250 with duel tanks. switching from front tank to rear tank it continues drawing from front tank.?

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why would that be?

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  1. you should have stated that in both your questions there is a tsb part from ford that hooks up to the top of thetanks and it is a one way check valve that stops that problem the originals went bad and they started pumping fuel from one tank to another phone ford they will know

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