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1990 Buick Century W/3.3 won't run/start after reaching operating temp., no fuel pressure at rail
Have 1990 Buick Century w/3.3 engine (78000 miles) First sign was it cut out at highway speed (65) picked back up w/no problem for a few days. Got to work one night, killed engine, wanted to move, but would not start, next morning started up w/no problem. Stopped to get gas, it would not start, after a few trys it started. Got home, when time for work, started fine. About 12 miles down the road started cutting out and finally quit, no fuel pressure at rail. Towed to shop, would start but not accelerate. After checking had a bad Ignition Control Module, installed new one. It cranked right up, let it warm a couple a mins. accelerated, did great, thought alright, fixed. Was running while putting tools up, then died, would not restart, no fuel pressure at rail. Could not hear fuel pump, installed new one as well as inline filter. Same thing will start good, run good until reaches operating temp. and may die or stall in gear...will not restart, still no fuel pressure at rail. Have spark, can spray starting fluid in intake and it will run.
What would stop power to new (OE) fuel pump so it won't come on?
Really would appreciate any ideas on this.