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Originally Posted by 2000CAYukon
I also have a 90 GMC K1500 and yes the paint is in bad shape. No starting problems (yet). Your problem sounds like the fuel pressure regulator. When the engine is off for a while, the pressure is down and it takes some time to build back up.
Try this, next time you go to start it, turn on the ignition but do not engage the starter. Let the fuel pump prime for 5 - 10 seconds and then try to start it. If it starts right up, the fuel pressure regulator is bad.
//2000CAYukon
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Thanks for all the good suggestions on how to repair this problem.
looks like I will be replacing the fuel pressure regulator.
Thanks again.