Question about Ford E-150

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1990 Ford E150 died on the road. New external fuel pump was installed. Vehicle started working again but the new fuel pump hums continuously. Could it be that the in-tank fuel pump is bad?

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Effectively the problem can be that the second fuel pump located on the fuel tank side is not working. In this case the engine side fuel pump will have to do extra job and there you get insufficient pressure.

Check if the seconf fuel pump is working by energizing it and testing that pressure is steady.

Check if there is debris coming from the fuel tank that may have clogged the line.

Test pressure out on the new fuel pump, the new replacement may also be faulty (it happens).

To read pressure you can use a simple hand tool gauge like this one:Actron CP7802 Vacuum and Fuel Pressure Tester .


Posted on Jul 18, 2009


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Posted on Jan 02, 2017


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