1988 Chevrolet G20 Intermittent No-Start

GMC
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WMP
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I am working on a 1988 Chev. G20 van w/ a TB 305 powertrain. Sometimes it starts, & sometimes it won't, but after waiting a day or so it will start. On occaision it turns over quite a few times before it fires. I suspect the fuel pump, any thoughts?
Apr 11, 2006 at 5:03 PM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
Sound slike a bad oil pressure switch. The fuel pump circuit goes through the pressure sw before it gets to the pump. You must have oil pressure to run after the fuel pump relay times out (about 5-9 seconds) Good luck
Apr 11, 2006 at 11:48 PM
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Suggested Repair

Test and replace the oil pressure switch if faulty. The fuel pump circuit runs through that switch, and oil pressure is required to keep the pump running after the fuel pump relay times out in about 5-9 seconds.

Conversation Summary

The owner of a 1988 Chevrolet G20 van with a TBI 305 reports intermittent no-starts that may resolve after waiting a day, plus long cranking before it fires, and suspects the fuel pump. The expert says a bad oil pressure switch is more likely because the pump circuit passes through it and needs oil pressure after the relay times out.

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