my 2008 f150 5.4 fuel pump stays running even with engine off & key out of ignition what is causing this

Asked by Apr 22, 2017 at 09:21 AM about the 2008 Ford F-150 XLT 4WD

Question type: Maintenance & Repair

1 Answer

10,760

Are you absolutely sure it's the fuel pump? Or are you assuming it is the pump because that sounds dangerous .. not to mention how hot a 'runaway fuel pump wire can get. If someone installed something wrong they could be "back-feeding" the run circuit. (seen it happen on a new sound system) If you shut the key off the complete "run" bus inside your fuse box is remaining energized ... if that happens the engine should still run even if the key is removed.

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