How much PSI?
How much PSI should the fuel pump be pushing out on an LT1? I want to diagnose my mysterious starting problem. I searched and got 50psi and 24gph is that right?
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1) Per the FSM 41 to 47 PSI engine idling, vacuum line to regulator disconnected. (pump pressure test)
2) With vacuum line connected pressure should drop 3-10 PSI from that noted in step 1. (regulator function test) 3) At WOT under full load, pressure should hold 41 to 47 PSI. (fuel delivery test) |
Originally Posted by z28pete
(Post 452161)
1) Per the FSM 41 to 47 PSI engine idling, vacuum line to regulator disconnected. (pump pressure test)
2) With vacuum line connected pressure should drop 3-10 PSI from that noted in step 1. (regulator function test) 3) At WOT under full load, pressure should hold 41 to 47 PSI. (fuel delivery test) |
The pump primes the system when the ignition key is in the ON position. If the engine does not start within 2 seconds the PCM turns the pump OFF. In a properly working system the fuel pressure will hold with the engine off for several hours.
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Originally Posted by z28pete
(Post 452187)
The pump primes the system when the ignition key is in the ON position. If the engine does not start within 2 seconds the PCM turns the pump OFF. In a properly working system the fuel pressure will hold with the engine off for several hours.
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First of all the car is fuel injected so pumping the gas pedal accomplishes nothing except to confuse the PCM. By you turning the key ON & OFF several times forces the pump to prime for a longer time and get the fuel pressure up. Before blaming the pump, you may want to check for a leaky injector, as the symptoms are similar.
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Originally Posted by z28pete
(Post 452196)
First of all the car is fuel injected so pumping the gas pedal accomplishes nothing except to confuse the PCM. By you turning the key ON & OFF several times forces the pump to prime for a longer time and get the fuel pressure up. Before blaming the pump, you may want to check for a leaky injector, as the symptoms are similar.
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