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Correct pump for the truck? A blown fuse means there is too much current draw from the pump. Why is the tough question.Pinched wire? If the fuse does not blow,immediately,can you measure the current draw at the pump in put wire?
Be SURE to cycle the key on for 5 seconds,off for 2 and back on for 5 seconds 3 times! Prime the pump. If not primed,properly the new pump may burn out. Sorry.
The fuel pump doesn't have a single designated fuse, it gets electrical input voltage from several sources, the fuses tart you need to check are the 7.5A ignition fuse, the 15A EFI, the 15A starter. There are two relays that are involved, the circuit opening relay located behind the glove box and the EFI main relay located in the fuse box under the hood, the most common problem when there is no fuel pressure is the fuel pump, check all the fuses and substitute the two relays to see if it solves the problem.
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.
Look in the fuse box under the hood. Look to see if the 15 amp EFI fuse is blown. If so, you may have a short circuit at the fuel pump wiring under the bed/on top of the tank. If it is not blown, you may have an open circuit on the same wire; this is a very common issue to the 94 trucks.
The most common reason for the EFI fuse to blow is the wiring is rubbed through somewhere in the engine wiring harness, this fuse supplies power to many EFI parts on the engine, always look for shorts where the most movement is, the engine is that place, most likely the next time you go down a really rough road the short may occure again, carry a few fuses just to be safe.