Question about 1994 Jeep Grand Cherokee

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How do i know if my fuel pump is bad - 1994 Jeep Grand Cherokee

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  • Richard Scordino May 11, 2010

    There are pressure and leakback tests you can do to determine if pump or regulator are bad. (tests can be found in just about any half decent service manual & require a high pressure gauge) No test is valid unless you are certain that the filter is clean. What makes you think you need a pump?

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Best bet is to get the fuel pressure, Not sure about yours but most have whats called a shrader valve on the fuel rail, so get or borrow a fuel pressure gauge, screw it on the valve or plum it in-line on the system. Once that is done turn your key to the on position and check the guage it should read up around 40 to 65 psi depending on the specks of the truck. If it does start the truck and watch the guage for any irregularitys such as the neddle bounching and so on. A nother eays check just to cover the basis if after all this complete, turn off thruck and watch guage. Make sure it hold pressure, if not i would start to look toward injector o-rings. If it is not holding pressure it can simulate a hard stsrt associated with and some times confused for a faulty fuel pump.

Posted on Mar 05, 2009

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