Question about Cars & Trucks
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
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
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