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There were code keys that you could plug into the diagnostic port to bypass the relay pre 95 that you could get from the dealership for about $1 however have not seen them in years if you go to a dealer parts window and ask them they should be able to print a diagnostic port diagram and tell you which terminals to jump to test the fuel pump circuit
The Feol pump/circuit opening relay is located inside the cab on a relay block either behind the glove bosx or the right kick panel, I'll see if I can locate a location diagram and post it in a follow up. In the meantime locate the diagnostic check connector under the hood,it's located near the right fender on a fuse block, open the cover and put a jumper wire between the terminals FP and B+, turn the key on and let me know if this makes the fuel pump run.
Have you tried checking with autozone? They can tell you where it is from their computer. I have a 99 k2500 and my fuel pressure regulator is located under my intake manifold, my fuel pump relay is under the hood on the drivers side over the wheel well. I Take It you are having problems starting your truck. Can You hear your fuel pump when you turn the key? Have you checked to see how much fuel pressure you have ?
The 15a efi fuse pwoers the computer fuel system components including the pump. If you NEVER have pump power, I would check the FP terminal in the underhood diag connector...this is the FUEL PUMP POWER wire tap. If it never gets off zero at any key position (Run or crank) your problem is either wiring, the circuit opening/Fuel pump relay, or the efi main relay, or the fuse itself. If it has power in 1 position but not the other, suspect wiring, or possibly the airflow meter. fuel pump switch power is run thru the airflow meter, if its not hooked up, the fuel pump relay cannot be closed in the run position, or if its open internally or the contacts are bad.
you are going to have to have the wires from the underside of the relay checked for a short or the contacts for the relay to plug to for tightness.Fuel pumps usually dont burn up relays wires burn up relays like maybe even a pinched wire when the tank was removed and re installed.
There is a relay that supplies the voltage to the fuel pump during starter operation and for two seconds after start-up. There is another relay that closes to provide the run voltage.
The run relay is located in the fuse/relay box mounted on the left inside fender. See the cover label.
Another source of your problem could be the igniton switch, as it returns to the run position, with contact failure.
Also check all the fuses, you never can tell with these computerized motors withou having the actual wiring diagrams.