Question about 1999 Jeep Grand Cherokee

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Will not start and have put two new fuel pumps in it

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Try replacing the relay switch there is only a short list for fuel delivery with jeeps 1. pcm (computer) 2. relay switch 3. fuel filter. 4. fuel pump

Posted on May 10, 2010

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I put a new fuel pump in rear tank and fuel filter but not starting.im getting fire at fuel pump but no fire from relay .i put new relay still nothing


Fuel pump will usually only run when on Crank. When engine fires up then it stays running. This is so it won't pump in a crash.

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Turn the key on you should hear a humming sound from the fuel pump pressurizing the fuel system. Just leave the key on for a 10 -15 seconds and then try to start the car. do not pump the gas pedal. If that does not work you may need a new fuel pump. Check the fuel pump fuse.

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fuel pump died replaced it truck ran poorly afterwards. Had a prussuer test done pump determend pump was no good. Put in another ran good for 2 days started running poorly hard to start no power. 2nd fuel pump. So i figure another bad new fuel pump wow changed it put in a third brand new fuel pump. Still will not eve start now. I had it tuned up 2 months ago new plugs rotor, cap, etc. put in a new fuel filter made sure it is on proper checked all connections for leaks. this cannot be a fuel pump problem now. no problem with the elctrical i figure i have great spark on ignition tester. I can hear the fuel pump prime when i turn the key. but when i went and checked the fuel port i had no pressure. When it is being cranked gas sews out of the test port. Also i dont if this is comon cause i used to turn my keyand go. but when i have someone turn the key and i listen at the gas tank whn the key is shut off i hear gs spraying back into the gas tank. So i am open for opinions.

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