Super hard to start running real rich
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Joined: Sep 2002
Posts: 2,193
From: High Ridge, MO
Well, in all reality, you need to learn to diagnose the problem, $5 or not. It will help when it comes to the much more expensive things. Here are the fuel pressure specs:
For the pressure specs:
Start the engine. Remove the vacuum compensation line from the fuel pressure regulator, and plug the opening in the vacuum line. The fuel pressure should read 43.5psi. GM accepts any value between 41-46psi.
Reconnect the vacuum line. Fuel pressure should drop proportional to intake manifold vacuum. With a stock cam, you will see the fuel pressure drop at least 6 to 8psi when you reconnect the vacuum line. Now your gauge is reading 35-38psi.
Tape the gauge to the windshield and take it out on the road - max load/max RPM the fuel system should be able to hold at least 40psi. Anything less than that is too low.
Start the engine. Remove the vacuum compensation line from the fuel pressure regulator, and plug the opening in the vacuum line. The fuel pressure should read 43.5psi. GM accepts any value between 41-46psi.
Reconnect the vacuum line. Fuel pressure should drop proportional to intake manifold vacuum. With a stock cam, you will see the fuel pressure drop at least 6 to 8psi when you reconnect the vacuum line. Now your gauge is reading 35-38psi.
Tape the gauge to the windshield and take it out on the road - max load/max RPM the fuel system should be able to hold at least 40psi. Anything less than that is too low.
Last edited by Sweetred95ta; Nov 3, 2006 at 09:27 AM.
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