Question about 1989 Ford Econoline

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Can't use front tank. i fill the rear tank, front tank eventually fills up. switch to front tank, it'll run for about 5 minutes then stall. then i switch to rear...fine. why is the front tank filling up when i never put gas in it? i also changed the in tank lift pump in the front. i wouldn't mind just bypassing the front if i can.

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  • 40 Answers

Ok sounds like a electrical problem being an 89 its fuel injected eather 5.0 or 5.8 each tank has its own fuel pump and sending unit a dashboard switch, relay, fuse and switching motor. check your fuel line from the front tank it could be clogged. check for 12v pwr. to the front pump the sending unit will require 4V but not much. as soon as the fuel rail pressureizes the ECM shuts the pump off using the relay. Usually the tank switch goes bad first.

Posted on Sep 12, 2010

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Posted on Jan 02, 2017

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