89 4X4 stalls when warm

[Smokee]

My buddy's 89 454 stalls while he's running down the highway. I've done the usual checks including a code check. I can't find any problems. When it stalls, no fuel comes out of the throttle body. If it sits for a couple hours, it starts working again. It may run good for a few weeks, or a few days, then BAM...stalls out again. Plenty of fuel in the tank. Filters are new. I am gonna test his fuel pressure today. Any other ideas?? Heat sensor maybe? Oh yeah, it seems to be happening more frequently as times goes on.

Thanks in advance

[mbumgua]

Most likely fuel pump, but could be fuel pump relay or oil pressure switch--There is a electrical circut to shut off fuel when oil pressure drops to save engine -if oil pressure switch is bad could send computer no pressure signal shutting off fuel--also 88-89 had two oil pressure switches usually--one for comp. by distributer and one on drivers side engine.

[Smokee]

Thanks mbumgua, that makes perfect sense. I didn't know there were two oil pressure senders. Fuel pump pumps like hell, but something is shutting it down. I'll check the switches. Thanks again

[mverno3]

Check your ignition wires for worn insalation This would cause the wires to short out when the engine gets hot thus no compustion would happen

[Smokee]

There's no fuel coming out of the injectors, therefore no combustion. It was the engine saver shut off. Thanks again

[mbumgua]

Glad you got it figured out Smokee.