Hi Danny W. and all

Sorry to sidetrack this thread but I have an odd problem with my 91 TBI 350 (Chevy van) and it seems to involve this circuit. The van would shut down while running but would restart. While changing the inline filter (no improvement) and then pumping the tank out before dropping it, it became obvious that it was running exactly the same length of time before the pump stopped. I timed it and it was 20 secs. As long as the key was turned to OFF then back to RUN, the pump would always resume pumping normally. This would repeat 2 or three times then it would run for days just fine. The OP guage read normal when the engine quit.

After your last post, I'm thinking maybe my FP backup switch is bad and reading no oil pressure. Does the ECM allow the engine to run for a few seconds (say 20) with no oil pressure? Or perhaps the FP relay is bad? Must admit I can't even locate the relay in this van. It's a Mark III conversion BTW.

Again sorry to hijack but sooner or later this nuisance will strand me good. This is my first post...awesome site. Unlike anything else I've found.

Any help appreciated,

John