Originally Posted by FireRanger
I'm confused. You're turning the key ON. The fuel pump is supposed to turn on. Why would it shut off?
Normally it runs two times for 1-2 seconds each to prime the system, then it doesn't do anything else until it senses a signal from the distributor.
Does it stop running if you disconnect the TFI module? Lots of causes, seems to be kind of common; but very hard to pin point the specific cause. Honestly, if it's turning off when the key is off, and it runs OK, I would probably just leave it be. There isn't anything that's monitoring your fuel pressure, the priming function is static - so it's not going to be anything in your fuel system. It's going to be something electronic.
If fuse-able link were the cause, it wouldn't work at all.
If it were the relay, then it would run all of the time when the key was off.
I suppose you computer could be grounding the fuel pump relay all of the time (the computer is what controls your fuel pump operation), or you simply could have a short in the control wire between the relay and computer. You might be able to test that theory at the diagnostic connector as it has a fuel pump test - the test is the act of ground the control wire to run the pumps all the time to diagnose fuel pump circuit problems.