runs for maybe 30 minutes then quits

1994 CHEVROLET S-10
190,000 MILES
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YEA-BABY
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1994 S-10 pickup runs for maybe 30 minutes then quits. Will not restart. Will run for a couple seconds on ether. If vehicle is allowed to sit for 4 or 5 hours...it starts right up. Fuel filter is new. Fuel pump is about one year old.

Fuel pump pressure is 57 psi when things are running.

Fuel filter is new,fuel pump is 2 years old. Several sensors have been replaced including: TPS,IAC valve,EGR valve,O2 sensor,ign. module.

Also replaced coil,dist.cap and rotor.

4.3 liter, vin w CMFI fuel inj. system

When motor quits, it will always start after about 4 to 5 hours.

What do you think is going on??
Jan 11, 2012 at 8:48 PM
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RASMATAZ
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Next time it won't start, don't wait -recheck the fuel pressure and also look for an ignition spark immediately
Jan 11, 2012 at 8:56 PM
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RASMATAZ
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Monitor and Record the fuel pressure while engine is idling, is it between 55-61 psi at all times? Let me know
Jan 12, 2012 at 9:59 PM
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ICRASHFORDS
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is catalytic converter loose inside? these are notorious for this problem.
Jan 16, 2012 at 5:49 PM
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YEA-BABY
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catalytic converter has been replaced with a test pipe,
thanks for your interest.

I may have located the problem myself ... I will be replacing some of the fuel pump wiring harness...we will see
Jan 16, 2012 at 8:46 PM
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RIVERMIKERAT
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We'll be waiting for results.
Jan 18, 2012 at 9:07 PM