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What should the fuel pressure be for a 2002 Chevy Malibu?

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Fuel pressure, (41 to 47 psi).If the pressure is good then the pump is ok. If the pressure drops off fast after turning off the key then you have a bad pump or fuel pressure regulator. With bad mpg I would think a bad regulator. You can do a quick check on the regulator by removing the vacuum hose and looking for signs of gas in the hose. thanks.

Posted on Jul 11, 2009


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I just have one suggestion, after what all your mechanic already did. I would want to know the fuel pressure reading WHEN IT WON'T START. So you would need a fuel pressure gauge handy, for that time it won't start. Hook up the gauge and turn the key on- if at 59 psi, when the engine won't start, then you know the fuel pump and the relay sensor is not the problem. And so probably not a fuel problem, although you haven't checked the injector circuit, but likely that wouldn't exhibit a problem as you have.
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