I had a '96, but I think they kept this in the same location, you owner's manual should have the location.
The fuel pump cut-off switch, located in the jack compartment.....
It has a label.
It is impact activated, supposed to turn the fuel pump off in case of an accident.
They have been known to become intermittent....etc and prevent the voltage from getting to the fuel pump.
I would check that FIRST, since you have checked the other usual suspects for this problem.
I do not know if the PCM relay is involved in this or not, it has been mentioned in a couple of other posts.
My '96 had different wiring as far as the fuel pump is concerned and my documentation is all for my much older vehicle.