My sons 96 gmc 1500 died last night as he was driving it. It has ignition, fuel and air. I put a fuel pressure tester on it and it gives me 60 psi with the key on , with the key off pressure drops off rapidly. So its either fuel pump or fuel pump regulator am i on the right track or am I missing something?
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A little automotive help please !
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If it looses pressure rapidly when the key is turned off it's more than likely a non-return valve in the pump not closing.
All the valve is supposed to do is keep some residual pressure between injectors and pump so that it doesn't take 45 seconds of cranking in order to develop enough pressure to start.
What does the fuel pressure do when cranking ?
And how many miles are on it ?
If you have fuel, air and heat it should run unless it's got a timing issue.
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Originally posted by HTDUCK View PostIf it looses pressure rapidly when the key is turned off it's more than likely a non-return valve in the pump not closing.
All the valve is supposed to do is keep some residual pressure between injectors and pump so that it doesn't take 45 seconds of cranking in order to develop enough pressure to start.
What does the fuel pressure do when cranking ?
And how many miles are on it ?
If you have fuel, air and heat it should run unless it's got a timing issue.
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My '89 5.7 has no pressure till it pumps back up with the ignition on. Then it runs. I have to wait till the pressure comes back up before it will fire and run. I can sit there with just the ignition on and hear the pump till it reaches pressure. Then it will fire right off. Or I can turn the ignition/starter, and wait till the pressure comes back up for it to fire, .
Last three times mine would not start were due to corrosion inside the distributor cap, and plug wires there. Mine is notorious for collecting moisture there when it rains. That back firewall seems to suck rain up that direction for some reason, even with splash panels in there.Last edited by Texas Grown; 12-14-2018, 10:58 PM.
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Originally posted by Texas Grown View PostMy '89 5.7 has no pressure till it pumps back up with the ignition on. Then it runs. I have to wait till the pressure comes back up before it will fire and run. I can sit there with just the ignition on and hear the pump till it reaches pressure. Then it will fire right off. Or I can turn the ignition/starter, and wait till the pressure comes back up for it to fire, .
Last three times mine would not start were due to corrosion inside the distributor cap, and plug wires there. Mine is notorious for collecting moisture there when it rains. That back firewall seems to suck rain up that direction for some reason, even with splash panels in there.
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Originally posted by Texas Grown View PostHappens with the electronic I have too. Just a bad location for a distributor cap with those aerodynamics. And that body style.
The fish are biting. And there's hogs to be kilt. Gotta go!
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