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Old 07-08-2012, 09:25 AM   #1
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Question Fuel pump?

My 2001 Wrangler has right at 90k miles on it. A couple of months ago I noticed that after driving long distances my Jeep would start sputtering, and sometimes completely die, while driving it. It would struggle at an idle. The RPMs would be fine, then they would drop down to less than two or there hundred, then suddenly it would recover and they would rev back up. I changed out the crankshaft positioning sensor and it seemed to be running better. I drove for about six hours (from Flagstaff to Phoenix and back) the other day and it started to do the same thing again. I would think if it was the fuel pump, this would be a consistent problem. Any suggestions?

Thanks!

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Old 07-08-2012, 09:36 AM   #2
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Idk, you could have a clogged cat. If fuel is running and problems start after sustained heat the problem may or may not be fuel system related. What else is it doing?

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Old 07-08-2012, 10:27 AM   #3
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That's pretty much it. Just sputtering at an idle and while I'm driving, after the RPMs drop, I can floor the gas (with the clutch in, of course) and it will recover and I can drive it for a few more minutes until it does it again. It seems it's only after I drive long distances. Also, the times it has happened, I have been driving where it is very hot.
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Old 07-08-2012, 11:01 AM   #4
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Amy,

I had a similar situation on my Impala. It ended up being the gas cap was not venting properly. When it starts doing this, crack your gas cap.
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Old 07-08-2012, 11:05 AM   #5
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Like vapor locking?
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Old 07-08-2012, 11:10 AM   #6
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Quote:
Originally Posted by 269jeep
Amy,

I had a similar situation on my Impala. It ended up being the gas cap was not venting properly. When it starts doing this, crack your gas cap.
Very good suggestion! 9 time out of 10, its the simple things, but I'm usually the 1 out of 10
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Old 07-08-2012, 11:15 AM   #7
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Try doing a tune up. Change the fuel filter with the tune up and see if that makes any changes. Often times the filter plugs up and restricts fuel from getting through. If no change then check your fuel pressure and see if it's with in the specified range. low fuel pressure is a good indicator of a bad fuel pump. But try a tune up first.
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Old 07-08-2012, 11:23 AM   #8
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I am not sure. When I cracked the fuel cap I could hear a "rush of air". I do not know if it was venting air out, or air coming in filling a vaccuum in the tank.
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Old 07-08-2012, 11:36 AM   #9
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Very good suggestion! 9 time out of 10, its the simple things, but I'm usually the 1 out of 10
Seems if I am away from home or broke it's never simple
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Old 07-09-2012, 07:30 PM   #10
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I opened the cap and air rushed out. Not just a little pressure, a lot. I don't know. Pretty frustrated about it. Thanks for everyone's suggestions. I'm going to keep trying each one out.
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Old 07-09-2012, 07:46 PM   #11
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Quote:
Originally Posted by AmyLynn
I opened the cap and air rushed out. Not just a little pressure, a lot. I don't know. Pretty frustrated about it. Thanks for everyone's suggestions. I'm going to keep trying each one out.
That is probably it, I've never had mine do that. Gas has to be vented, diesel doesnt. I remember when I was young my friend would screw with me by puttinga little piece of tape over the vent hole on the gas cap of my go cart, then after about 5 minutes it would cut off
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Old 07-09-2012, 07:48 PM   #12
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Thennext time it starts running funny, jump out and crack the cap while its running. It is more likely to do it with a full tank (less air in tank)
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Old 07-09-2012, 07:57 PM   #13
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Glad to hear you are making progress Amy.
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Old 07-10-2012, 02:36 PM   #14
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Also, it's not throwing any codes. And it only seems to do it with less than a half a tank.
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Old 07-10-2012, 03:15 PM   #15
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My 01 with similar miles was doing something close to that. I racked my brain as the coil rail wasn't that old and I have done great maintenance. I went back through receipts and realized I had bought the cheapest coil rail I could find from Autozone. I bought a new coil rail and problem solved. My buddy had some similar issues and his was his TPS (Throttle position sensor).

Just figured I would throw this out there. Also, in my experience a fuel pump won't give up and then come back...they just die.

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