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!

 

Anyone? Please help this is my dd and only wheels im taking a trip in two weeks this truck never lets me down

 

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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That would make sense. Running backwards not building pressure.