Try replacing the oil sending unit, Some years had a fuel pump shut of built in to the switch so if the oil pressure went down it would kill fuel pump to stop engine damage. Yours may be faulty
SOURCE: 98 blazer stalls
It could be your fuel pressure regulator, check this link for details:
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528022b9c4
That's what it looks like.
SOURCE: 1991 camaro RS Fuel pump not working- no power to pump
If the oil pressure switch has two wires on it it may be one that shuts down the pump. I'm not positive but I think it completes a ground circuit, not the hot side though (but may run through a relay.) There should be a pump relay under the hood with a group of other relays. I don't have a wiring diagram for your car but you can get a basic diagram in most inexpensive manuals. They wont usually give you locations but at least you can get an idea of how the system works. There usually is a fuse. If the fuse block is not labeled, use a test light and probe the back of every fuse for power with the key on (takes about ten minutes and faster than trying to find info) change any that are blown. The most likely culprit is a relay, so after testing fuses look for it. (usually on drivers fender or on right side near firewall.) Worst case, trace the power lead all the way through the harness 'till you find where power begins.Testing is important here...I could give you much better info if I was there to do it for you. Most important is to stay "on track" till you find the place where power ends. Don't jump all over the place or you will end up doing an incomplete test.
SOURCE: chevy blazer 97 replaced the fuel regulator and pump and still
mine was doing the same thing, the mass air flow sensor and throttle position sensor were dirty...i changed the tps myself but had the dealer do the mas.
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