What about your fuel rail regulator, which is in the tank with the fuel pump on some cars? Does it have a pressure switch/sensor that isn't telling the engine control module to shut the pump off when the rail pressure is obtained? If you turn the vehicle to on (not start) and the pump runs more than a couple seconds, like until the fuse blows, it could be either a stuck pump relay or worse, the fuel pump control signal. Pull the pump relay, add a new fuse and see if the pump runs with the key in the on position again, which it shouldn't. If it doesn't run, the issue is either the relay, or the control signal to the relay that is keeping the pump on all the time, causing the fuse to blow.
It sounds to me like the pressure is going to high and stalling or slowing the pump causing excessive current from the motor and blowing the fuse. If that's the case your old pump might not have been the problem. How's the fuel filter? That's in line with the fuel line to the fuel rail?
You don't have to answer the questions, just look into them for your own peace of mind.
SOURCE: keeps blowing 15a efi fuse 1991 toyota pickup 2.2 re
there's a short somewhere causing that amperage to go up
SOURCE: 1991 toyota 4runner keeps blowing efi fuse even changed fuel pump
That fuse powers the engine computer and various sensors.
You may need a repair book or shop manual to get the wiring diagrams for checking everything in the circuit.
SOURCE: 1991 toyota 4runner efi fuse keeps blowing
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.
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