fuel pump pressure
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Joined: Jan 2010
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fuel pump pressure
why doesnt my fuel pump shut off after a few seconds when i fist turn key on ,codes po191 p1237 is there a pressure regulator to adjust or is it in the tank with the fuel pump 2005 explorer 4.0
Elder User
Joined: Nov 2008
Posts: 668
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From: Northfield, MI
There is no pressure regulator. The fuel pressure is controlled by the PCM through the use of a Fuel Pump Driver Module and a variety of sensors. This is a fairly complicated system and most of the parts are not cheap. To diagnose this you'll need a scan tool capable of viewing parameters and also the PCED manual from Ford/Helm.
Jay
Jay
Postmaster
Joined: Jan 2009
Posts: 4,584
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From: Chesapeake, Va.
If your fuel pump starts and stays running when you turn the key on and not start the truck, you may have either a leak in the system or a bad injector(s).
You should have the truck checked by a professional.
You should have the truck checked by a professional.
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i found that i had a bad wire connection on the module which is located in the far back right quarter panel near the rear bumper,there are 2 plugs connected to the module,unplug the plugs @spray contact cleaner on both ends @check wires for any bad spots,look especially near frame where your spare tire is located
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