Question about 1987 Ford F 150
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Posted on Jan 02, 2017
SOURCE: fuel pump relay
I have found the relay at my local auto parts recycling center, after many hours of troubleshooting, I also found the PCM to be faulty. A replacement computer is on order. This model has been modified by prior owner removing the inertia safety switch. A replacement is also being sought. A similar problem occurs when the ECT (engine coolant temperature) sensor is destroyed.
Whatever you do, DO NOT REMOVE THE INERTIA SAFETY SWITCH. This does protect the fuel pump and related circuit. Also linked to the fuel pump circuit is the main relay, and the injectors.
If you find the thermo fan starting within seconds od rotating the engine, the problem is the main relay earth, PCM (needs replacement) and/or the fufel pump relay. This is known as LIMPO HOME MODE.
Posted on Sep 30, 2008
The Fuel pump relay is in the Power Distribution Box under the hood, it is relay K. If it is the fuse then fuse 17 in the PDB.
It could also be the cut off switch, which is either under the dash above the brake pedal or behind the passenger kick panel
Posted on Feb 24, 2009
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