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Okay, from the 1972 Chevrolet Service Manual the fuel pump pressure for the 1972 LT1 is 7 to 8.5 psi. Volume is one pint in 30-45 seconds at cranking speed.
The 1972 LT1 uses the AC 40956 pump so I am assuming these are the correct specs for that pump.
The Service Manual instructs to test the pump deadheaded.
Last edited by TurboTodd; Nov 16, 2024 at 07:54 AM.
So I did complete the fuel pump pressure test. This would be the deadhead test the manual refers to.
This car is new to me so I dont have history on the current fuel pump but it looks new. Or as least a new rebuild as it is the proper 40965 with the correct date for the car.
Did the test three times and got 6psi - 6.5psi and 6 psi.
I am happy with that as i think the Holley likes that pressure. It also is in line with PJOs post
