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Old 08-16-2014, 04:06 PM   #1
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I think my fuel pump is going bad but unsure

Hello All,

I am trying to figure out what is going on with my jeep but I am unsure exactly what it could be. I have some idea but nothing solid. I'd like to say what is going on and hopefully someone can give me some idea of what might be wrong.

I have a 1994 2.5l Jeep Wrangler. I got home from it last night and everything was working perfectly but this morning it didn't really want to work. It too me 3-4 tries in order to get it to work. Once I got it going I had a check engine light and it was hesitating really hard. After giving it some fuel and waiting awhile it got its revs back up to where it should be. I drive it but once I get to a stop sign it goes back to the way it was. It shut off on me once or twice on the way home and I had to wait for about 5 minutes. Then I started to drive on it again and ended back up in the same boat 10 minutes later.

I think it is a bad fuel pump or fuel filter but it could also be my O2 sensor. Someone mentioned it could be a cam or crank sensor.


Recap
Will Start but then immediately turns off
Started (After several tries)
Hesitate
Goes to normal (After giving it gas and little it idle for awhile)
Drive around
Come to a stop light and it goes back to acting up

Any help would be greatly appreciate.

Thank you,
Ryan

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Old 08-16-2014, 05:07 PM   #2
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To me it sounds like a fuel filter. It is $15 and 5 mins of time. If you don't know when yours was last replaced, it is good insurance. A clogged filter will overwork the pump and cause it to fail down the road anyway, so it is money well spent.

A clogged filter will exhibit the failure you have outlined, the engine will run at higher rpm and die at lower rpm.

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Old 08-17-2014, 06:18 AM   #3
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mine acted somewhat like that whenmine went out but when it wouldnt start i would simply kicck the tank and she would fire back up..it could also be ur fuel pump relay.
but likee stated above i would replace the filter first...cheap and easy an go from there..
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Old 08-17-2014, 10:11 AM   #4
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I just replaced fuel filter. The content looked extremely dark, is it supposed to look that way? When I started it seemed just fine but after about 2 minutes of driving it in second it died. Any idea?

So it's a 50/50 chance if I start it up it will idle low or it will idle just fine. When it starts fine I will begin to drive and it will start acting up, it sounds like it's misfiring and then it'll just shut off. I'm thinking about taking it into a dealer to put on one of their machines and then doing whatever they say they're going to do.

Also on the fuse, how could that cause it to sputter? I pushed on the fuse and it's sunk into there, I figured it would be either on or off not sputtering and then die.
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Old 08-18-2014, 12:11 AM   #5
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electrical..gremlins...it could be starting to go bad..

but the darkish color could be a dirty tank...may need to give it a good cleaning and flush your fuel lines.....
im sure someone else on here with more excperince than me has other ideas,,,,these are just a couple of issues i have dealt with myself...dirty gas cant be good on injectors or other stuff , the fuel pump relay is an easy fix,,aswell as the ecm, and a hint if u have to drop the tank might aswell replace the sending unit while ur there and if ur straps are worn pick up some in advance....i didnt and couldnt find any around here to save my life so i had to fab up a couple...
best of luck..ole buddy
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Old 08-18-2014, 11:50 AM   #6
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Not sure what you are talking about when you ask about the fuse? Are you referring to the relay?

If you are still fighting this issue, throw a fuel pressure gauge on the rail and see what it is doing. Double check that the vac. hose connected to the fuel pressure regulator does not have any gas in it. Disconnect the fuel pressure regulator at idle and see what the engine does.

And no, dark stuff coming out of the filter is not a good thing. I would avoid the dealer, you have a 94, so they can't hook up an OBDII reader to tell them what the issue is, someone is going to need to do some real troubleshooting....I don't know that dealer techs have any experience doing this sort of stuff these days. Personally I tend to prefer to throw parts at a problem and have a whole new system, then pay a repair shop the same amount of money to replace a single $5 part.
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Old 08-18-2014, 12:08 PM   #7
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I just dropped it off that the dealer today to see if they can trouble shoot the problem. I probably won't have them do the work on my jeep, I just wanted to see if they can trouble shoot it the hard way. When they tell me what they think it is I will go in and talk with the tech and see if I agree. Then I will decide what I am going to do. I have a friend who thinks it could be a crankshaft or cam sensor that is going bad.

I'll update this post when I get the information. Wish me luck!
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Old 08-18-2014, 11:35 PM   #8
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yes let us know,,,but my guess is a dirty tank..just becaused ofv the fuel color and it just quickly clogging up ur filter and lines again...but just a guess..
very interested in ur problem hope its a simple fix for ya..
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Old 08-19-2014, 03:05 PM   #9
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The dealer said that my map sensor was unplugged. I am not quite sure about this but I am planning on picking up tomorrow morning. I'll drive it around for a bit and see if it's still dying. Hopefully it was just a stupid mistake on my part.
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Old 08-20-2014, 06:47 AM   #10
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that could be it also....i picked up a used ranger one time on the to cheap to pass up kinda deal....and after buying it i found that that was it...plugged it backm in ran like a charm...ifmit would have been a 4x4 i would have kept it,,,,but i have no use for a non 4x4 truck and made a good bit of profit and gave someone a heck of a deal on a nice clean and great running truck...
i hope that is all that is wrong with urs...but i would still check fuel color again,,,cant hurt..
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with trail rash..and getting 25mpg,s
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Old 08-20-2014, 10:38 AM   #11
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I am going to hopefully talk with one of the mechanics tomorrow morning and I have a few questions for them to see what they have to think about it. Still waiting to see if my problem is solved.
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Old 08-21-2014, 11:58 AM   #12
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That was the problem, my jeep is running again.
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Old 08-21-2014, 09:37 PM   #13
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also look at your fuel pressure regulator I was having similar issues.. While I was reving it under the hood I noticed small bubbles in the clear plastic vacuum line cap that comes off it to the intake.. So I just replaced that and now the beast is pealing out with out even trying.. Also once you get it back of its still acting up pull the plugs and see how they look..

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