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Old 06-06-2010, 01:28 AM   #1
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Exclamation fuel pressure help ASAP!!

HELP!!! i just replaced my fuel pump today and it all seemed to be working fine and then all of a sudden my jeep started sputtering and lost fuel pressure at mid acceleration and now im at a lose, i have to leave town Monday and need help. I can accelerate but when i get on the gas halfway is when it starts to die.:confu sed:

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Old 06-06-2010, 06:05 AM   #2
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I am no mechanic. I have a Haynes repair manual that covers a '98 TJ.....which is what I have. I looked under TROUBLESHOOTING with the symptoms you described (Hesitatation or stumble during acceleration) and what I find is:

Ignition timing incorrect.
Ignition system not operating properly
Dirty or clogged carburetor or fuel injectors
Low fuel pressure - check fuel pump
Carburetor out of adjustment

My guess is that you got a faulty Chinese fuel pump. If not that, probably clogged fuel injectors. Hope this helps! Good luck.

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Old 06-06-2010, 06:12 AM   #3
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have you checked the pressure at your fuel injection rail? do you actually have pressure at the rail with your engine running?

that would be the first thing I check.

If you don't know how to check it........there is a little cap on the rail, it looks like a tire inflation cap. Take the cap off and touch the nipple with your finger, just like you would relieve air from a tire. If there is pressure on your rail, you will get gas to spray out of the nipple. Maybe have a paper cup handy to catch some of the spray.

This will at least give you an idea if your new pump is actually working.

hope that helps some......
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Old 06-06-2010, 06:56 AM   #4
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I was just talking to my B-I-L (who is a mechanic) and I ran your problem by him. He said it's possiible since your gas tank had to be removed and reinstalled to change out that fuel pump that a fuel line may have gotten crimped. He's removed his Jeep's tank and says it's possible.
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Old 06-06-2010, 12:53 PM   #5
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Did the fuel line 'click' and seat into its fitting next to the fuel tank properly? Maybe it wasn't seated all the way in and backed out.
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Old 06-06-2010, 02:03 PM   #6
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Yea, make sure that butterfly clip is ALL the way secure, as well as try priming your fuel pump to see if it turns on. Basically, turn the key to the position before RUN (ON I think) and listen for it to prime (a whirring sound). Is it working okay or is it not priming?
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Old 06-06-2010, 03:08 PM   #7
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its priming as I listened for it and the jeep feels like its getting deprived of gas when i push on the gas pedal. I can barely push on it and get going but if i give it any more than a half inch of pressure it starts to cut of. also when idling for a while it starts to sound like it is going to die. When its running there is fuel pressure as I checked that.
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35x13.5x 15 Toyo M/t's
exhaust, headers, all the other good stuff!
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Old 06-06-2010, 05:18 PM   #8
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So did you check that the fuel line connectors are fully seated as suggested several times above?
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Old 06-08-2010, 11:34 AM   #9
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turned out to be a defective fuel pump, all good now.

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1998 TJ wrangler
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35x13.5x 15 Toyo M/t's
exhaust, headers, all the other good stuff!
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