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Unread 03-01-2008, 07:31 PM   #1
parrisjr
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89 Cherokee won't start?

I am getting good spark but no gas. After trying and trying the plugs are not wet even the slightest. I can hear the fuel pump running and I have removed the fuel line from the fuel rail and verified gas. If the pump is weak will the lack of pressure keep gas from getting to the cylinders? HELP!!!

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Unread 03-01-2008, 08:10 PM   #2
tangofox007
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Which engine?

Never mind. If it has a rail, I suppose it has to be a 4.0L.

A bad fuel pressure regulator can cause the same problem as a bad pump. So could a clogged fuel filter. Checking the fuel pressure would be a good idea.
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Unread 03-01-2008, 08:20 PM   #3
parrisjr
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Yes it is a 4.0. The fuel pump is also very loud but has been for some time. This problem has gradually been getting worse. Today I was able to get it to crank for a few seconds by trying several times and hold the gas pedal to the floor.
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Unread 03-02-2008, 07:04 AM   #4
tjwalker
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A fuel delivery problem of some sort seems most probable. Pump is certainly suspect here especially if it's been loud. I agree with recommendation for testing. Put a fuel pressure gauge on the schrader valve on the fuel rail. If you don't own this equipment, you can rent from many of the bigger parts store. Compare to spec. Change fuel filter if not already done so. Good luck and post back what you find!
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Unread 03-02-2008, 07:39 AM   #5
parrisjr
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Thanks, I will try the pressure check tomorrow if I can. Does anyone know if it takes a certain amount of pressure to get gas through the injector? Just not really sure how injectors work. The electrical connection to the injector does what? Does it regulate some sort of opening?

Thanks for all the help!
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Unread 03-05-2008, 05:06 PM   #6
parrisjr
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Okay. I brought home a pressure tester today and connected it to the fuel rail. The pressure is 37-39 lbs. That is right on according to the technical manual. Still no crankie! Anybody know where I should check next?

HELP
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Unread 03-05-2008, 05:55 PM   #7
tangofox007
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What is the history of this problem? Was the engine running fine, then one day refused to start?
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Unread 03-06-2008, 03:09 PM   #8
parrisjr
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I have noticed over the past several months that sometimes in the morning it would act funny while cranking like it was firing before the piston would get to the top. Meaning it wasn't smouth during the startup. This only happened a few times. But to answer your question yes....I drove it to work one day drove it home that night and when I went back outside the next morning it would not crank. It has started one time for a few seconds while my wife was helping me. She held the throttle to the floor while turning it over and it fired but shut down again. The last couple of afternoons when I get home I have tried it and it sounds as though that it is trying to crank but doesn't have enough gas in the cylinders to fire up and run.
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Unread 03-06-2008, 04:14 PM   #9
cobra
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clogged fuel filter or a bad fuel pump relay, not sure about the jeep but thats what my ranger was doing until i replaced relay, also check for loose ground somewhere between relay and pump
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Unread 03-06-2008, 04:54 PM   #10
parrisjr
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I have bypassed the fuel filter and can hear the pump running and pumping up to pressure everytime the key is turned on?
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