Quote:
Originally Posted by greasemonkey
Air, fuel, spark...any details on the truck like miles, maintenance, engine codes, etc would help. If it was running fine one day and not the next, I'd check the fuel pump. Usually you can hear them running to prime the system for a few seconds when you first turn the key on.
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One thing to check is the oil pressure switch to fuel relay circuit.....they are designed not to run without proper oil pressure thus the oil pressure switch is a 3 wire setup.....a test light and a multimeter will help you figure it out.......search youtube for a "crank but no start issue" for gm truck.................