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Discussion Starter · #1 ·
My plow truck has decided not to run! Turning the ignition on the fuel pump does not run. Going to the run position and holding it for awhile the fuel pump still does not run. Squirting starting fluid into the throttle body the truck starts and runs until the starting fluid is used up. Tested the fuel pump relay and the fuel pump relay socket as follows:

Just got done testing my fuel pump relay off of the truck using a multi-meter and a 9 volt battery. It works fine, so I think I have a problem in the wiring or some other sensor or switch. I tested the fuel pump connector with the key on and the key off with a power probe and got the following results,
Key Off socket A 12 v pos Socket C open, Socket F open, socket E ground, socket D Ground.
Key ON socket A 12 v pos, socket C open, socket F, E, D ground
socket diagram __ ____ __
F E D
___ ___
A C

Is it possible and okay to run power to the ADL , then start and run the plow truck that way. I know I'm passing the low or no oil pressure safety that way but need to have the truck running to plow with.

Also does anyone have any idea of what to check next, I'm about of ideas.

Thanks,
Bill
 

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Wiring diagram time
 

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Wire diagrams can be had for free if you look long enough. Theres not alot of wires in a 1990 truck.
Personaly if it was snowing or really cold that fuel pump would get a toggle switch and wireing zip tied to the frame. What ever it takes to keep the truck running in the winter, repair it on the mild days or off season.
 
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