80psi fuel press readings

80psi fuel press readings

Postby TurboPirate [OP] » September 24th 2012, 9:23pm

Hello everyone at this awesome forums, I justt bought a Chevy Astro 1996 on November the previous owner installed new ac delco assembly fuel pump with sender strainer etc. Now it is a pain to start the engine, I turn key engine cranks but takes to long to fire up, I check fuel press and its at 80psi at idle, 70psi at 50% TPS or WOT, I check the return line at idle and there is fuel, any help is apreciated.
P.S. is a Vortex engine with the fuel press tool if I press the release port and manage to lower press to 50 engine works perfectly....thanks in advance Turbo
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TurboPirate
Fueling (Empty tank)
Fueling (Empty tank)
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Re: 80psi fuel press readings

Postby chevymaher » September 24th 2012, 10:08pm

Makes sense your fuel pressure should be 58-62 range. Pressure regulator not working right, something partially blocked etc, etc.
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Re: 80psi fuel press readings

Postby TurboPirate [OP] » September 25th 2012, 3:58am

Thanks, I am planing on removing the return line and adding a hose to portable gas tank, start the engine and see if the pressure goes to proper reading, this way I'll look at the return line to see if there is something blocking the flow, if fuel press is still high then I'll remove upper intake manifold and see if the problem is fuel press regulator, thanks in advance Turbo
Original Poster [OP]
TurboPirate
Fueling (Empty tank)
Fueling (Empty tank)
Years of Membership: TurboPirate has been a member for 7 full yearsTurboPirate has been a member for 7 full yearsTurboPirate has been a member for 7 full yearsTurboPirate has been a member for 7 full yearsTurboPirate has been a member for 7 full yearsTurboPirate has been a member for 7 full yearsTurboPirate has been a member for 7 full years
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Extra Info: 4.3L 4L60

Re: 80psi fuel press readings

Postby TurboPirate [OP] » September 26th 2012, 12:32pm

Ok guys did the test with return line removed to a portable gas tank andtried all worked perfect at 55psi, used a air gun blowed intio return line and air did not pass freely, took gas tank down and the flare twisted the metal tube, who ever installed the fuel pump waas not careful and wile it was tightening the flare didn't notice tube was turning to, I cut the damage area used new hoses. Tested with gas tank on the floor all worked perfect, installed everything back re tested fuel press @55psi @ idle 60psi with lower vac at intake, thanks in advance Turbo
Original Poster [OP]
TurboPirate
Fueling (Empty tank)
Fueling (Empty tank)
Years of Membership: TurboPirate has been a member for 7 full yearsTurboPirate has been a member for 7 full yearsTurboPirate has been a member for 7 full yearsTurboPirate has been a member for 7 full yearsTurboPirate has been a member for 7 full yearsTurboPirate has been a member for 7 full yearsTurboPirate has been a member for 7 full years
Posts: 4
Topics: 2
Joined: September 2012
Gender: Male
Alias (AKA): Gregory
Van Model Year: 1996
Van Make/Model: Chevrolet Astro
Extra Info: 4.3L 4L60


 
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