Fuel pump
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Elder User
Joined: Dec 2010
Posts: 656
Likes: 4
From: Geneva,Ohio
I have it hot wired to the fuse box if the truck is cold it takes for ever to start and the gas guage reads maxed on full till it finally starts then the guage works right. This makes no sense!
Fleet Owner
Joined: Aug 2005
Posts: 23,666
Likes: 301
From: Easton,Ks
Sounds like a bad inertia fuel shutoff switch. I have heard of it doing just what you are talking about.
Make sure the fuel pump relay is closing and sending power with a test light when you ground pin 6 of the self-test plug with the key on at the inertia fuel shutoff switch first before you change out the inertia fuel shutoff switch.
If the fuel pump relay is closing and you have no power with a test light at the inertia fuel shutoff switch and the fuel pump fuse is good then you have a wiring problem under the engine compartment fuse/relay box.
If you have power in and out of the inertia fuel shutoff switch then you may have a bad dummy plug (fuel tank selector jumper) behind the dash by the headlight switch where the fuel selector switch would be on a two fuel tank system.
Diagrams below:
Inertia fuel shutoff switch:
Wiring diagram:
The engine compartment fuse/relay box wiring:
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Make sure the fuel pump relay is closing and sending power with a test light when you ground pin 6 of the self-test plug with the key on at the inertia fuel shutoff switch first before you change out the inertia fuel shutoff switch.
If the fuel pump relay is closing and you have no power with a test light at the inertia fuel shutoff switch and the fuel pump fuse is good then you have a wiring problem under the engine compartment fuse/relay box.
If you have power in and out of the inertia fuel shutoff switch then you may have a bad dummy plug (fuel tank selector jumper) behind the dash by the headlight switch where the fuel selector switch would be on a two fuel tank system.
Diagrams below:
Inertia fuel shutoff switch:
Wiring diagram:
The engine compartment fuse/relay box wiring:
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mikeismadness
1987 - 1996 F150 & Larger F-Series Trucks
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1987 - 1996 F150 & Larger F-Series Trucks
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