Question about 1988 Ford F 150

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1990 f150 ford fuel pump will not stop running , ireplace the relay and that didnt work .but it will start once the truck set and warm up threw out the day

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I think your pressure regulater is bad, some are built into the fuel pump some older models were mounted on or near engine in the fuel line

Posted on May 15, 2014

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Then the engine fuse may be blown it will be marked ECM I think, the fuel pump and injector circuits are two seperate systems, the fuel pump most likely has a stuck relay.

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