andrewg29
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Does anyone know what the fuel pressure specs are for a 2002 chevy tahoe z71 5.3l with the flex fuel engine. I got 45 psi but I don't know if that's too low or not
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No lights and changed the fuel filter about 6k miles ago. Also when the engine is warm i have trouble starting the truck I have to cycle the ignition 3 or 4 times before the engine will starts and the truck won't start once it gets right above a quarter tank thats why I'm thinking I Have low fuel pressure and the FPR is good.Looks like 55-62 psi with key on, with approx 8 psi drop when the motor is running. However, I'm not sure if there is a difference for the flex fuel or not.
http://www.tahoeyukonforum.com/forum/showthread.php?t=21015
Have you changed your fuel filter?
Is your check engine light on?
It is a flex fuel it says it on the gas cap and the owners manual. And it's the check valve in the fuel pump I already figured it out. Thanks though.Your truck is a 2002? It's not Flex Fuel. They didnt come out until 05+ iirc
---------- Post added at 05:23 PM ---------- Previous post was at 05:21 PM ----------
Also, your pump could be going out. If you're having to cycle it multiple times, and it's low pressure.
No you're good I appreciate the help anyway.My bad. First I heard of that. I was going to say check valve next.