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I have a 1990 f250 ford pickup 7.5 liter engine duel tanks i replaced both pumps and line and the relay fuse it will start but wont stay started

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You actually have a total of 3 pumps on this truck. You have a helper pump in each tank and a pressure pump located inline just under the drivers side cab area, attached to the frame underneath the truck. The most frequent problem in this area is the valve that switches between the two tanks. Ford did correct this problem in later years, but in the 87 to 91 model years, they all had the potential for this very issue. Try running your truck on both tanks. If one operates correctly and the other does not, and provided you have changed out the in tank pump of both tanks and the one located on the frame, then I would say your problem is most likely the tank changing mechanism.

Posted on Nov 01, 2013

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Posted on Jan 02, 2017

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SOURCE: 1992 ford f150 duel tank problem, hard to start

The tanks have to be removed in order to change the fuel float sensors.

The hard to start issue could be related to a fuel filter that is full of sediment. The fuel filter could be in the engine compartment before the intake to the engine, but it is more likely an inline filter after the fuel pump on the frame rail. Change the filter and see if that help.

Posted on Dec 04, 2008

michigan man
  • 3533 Answers

SOURCE: car do not start fuel pump inop.2000 ford expedition 4.6 liter

fuel pump went out; my suggestion is to support vehicle and lower gas tank and change the fuel pump

Posted on Dec 31, 2008

daves944
  • 1050 Answers

SOURCE: Buick Regal dying

You have a problem in the fuel pump relay circuit for sure then. I'm betting the relay, but it could be that dropping resistor.

Posted on May 11, 2009

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