Question about 1991 Ford F250

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I have an 1989 f250 3/4 p/u with a 460 motor it runs good until I get low on feul between 1/4 and 1/8 of a tank of gas it ,then it starts stalling out on any kind of incline . It has 2 tank when I bougth the truck we out gas in the tank that I dont think was used alot.But it still ran good on the tank that was low until we figuered out about the gas gauge. That we had been using the wrong tank thats when the trouble seems to have started.My friend told me that this year truck had feul injection proplems.What do you think I can do.

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Not an injection problem, otherwise it would happen constantly, whatever the level of the fuel.
Something is wrong with the sump from that tank: it's either bended or broken. Take out the tank completely off the car and drain it; next take out the sensor and the fuel sump and clean thoroughly the tank - wash it with a high pressure nozzle then dry it completely; finally install a new sump then put the tank in. Now pour a few gallons in it and test it - the problem should be gone.

Posted on Mar 16, 2011


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If your front tank was much less than 1/2 full you may have a bad pump in the front tank. each tank has a low pressure pump that feeds the high pressure pump on the frame rail. If the pump in the tank is bad, the high pressure pump will draw gas from the tank (especially the front tank) until the tank get below 1/2 full then it loses its prime and the engine will stall. Try disconnecting the electrical connection at the high pressure pump on the rail and then cycle the key on and off and see if you can detect the tank pump running or not.

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