fuel pressure
I bought an 87 toyota pickup with a 95 V6 4.3L Vortec. I installed an inline fuel pump which had a max output of 60psi. around 3 months later the inline pump sounded like it was cavitating air and then it didnt have enough pressure to drive the car. so i pulled the pump and primed it, installed it, primed it with the ignition and then it ran fine. 5 minutes of driving after that and then i had the same problem again. i checked all of the fuel lines for leaks and couldnt find any. i then bought a new inline pump, but it only has a max output of 55psi. the engine wont even fire with it. with the old inline pump, if i primed it with the ignition enough, the engine would at least start up.
The Chilton's GM S10/Sonoma Pickups 94-97 repair manual states that for a 95 vin W, the engine needs 58-64 psi. Baxters autoparts is where i bought the last inline pump and the guy there was definately sure that it needed below 50.
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