Would these symptoms indicate a bad fuel pump - JeepForum.com

 
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post #1 of 7 Old 08-06-2005, 08:18 PM Thread Starter
gary1
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Would these symptoms indicate a bad fuel pump

1995 Jeep Wrangler 2.5L 4-cylinder engine. Multiport Fuel Injection.
The jeep started and made it to the end of my driveway and then stalled. There doesn't seem to be any fuel present when checking the valve on the fuel rail. (No, it's not out of gas)
I am assuming the fuel pump is in the gas tank, and with the key turned on, the fuel should shoot out the valve when depressing it.
Is there a fuel pump shut off on the jeep, similar to most cars that can be reset with a button in the trunk.
If it does turn out to be the fuel pump, is it a job a shade tree mechanic could handle in the garage.

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post #2 of 7 Old 08-06-2005, 08:45 PM
jblockhead
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I think you are correct. maybe the fuel pump didn't come on when you first started to go down your driveway, you just used to rest of fuel that was in the rail and lines. A good way to check for the pump working is to hear it energize(sounds like a hum in the tank) when you turn the key on. If not, then check for power to the pump, or you can just use a rubber mallet and hit on the bottom of the tank as someone tries to start it. Jeep doesn't have a shut off switch, sorry on that one. Removing the tank is easy, i don't think you need to raise the it at all.

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post #3 of 7 Old 08-06-2005, 08:50 PM
tobias94yj
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That could also be a clogged fuel line or fuel filter. I would check to see that you are getting juice to pump and if you are change the fuel filter next.

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post #4 of 7 Old 08-06-2005, 09:06 PM
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i'm not sure about a 95 but on my 90 there is a fuel pump test wire in the engine compartment. mine is a red wire on the pass fire wall. It has a black connector on it.next to it ther is a post to connect it to you. if you connect this wire the fuel pump will kick on with the key in the on position but not started. before i knew what mine was i plugged it in and when i turned off my truck it kepped running because the fuel pump would not shut off.
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post #5 of 7 Old 08-07-2005, 07:55 AM
drew2000
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I don't think there is a rollover switch on our jeeps.

You can test your fuel pressure by hooking up a fuel pressure gauge to the schrader valve on the fuel rail. Should be in the mid 30's IIRC. Also, you can test your fuel pressure regulator while you are there.

Dropping the tank is the only hard part about replacing the fuel pump. I consider dropping the tank to be a royal pain in the a$$, but it seems to come easier to others.

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post #6 of 7 Old 08-07-2005, 10:00 AM
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Definatley try your filter first. I went to leave Jersey a couple weeks ago and made it 100 ft from my dads driveway and broke down. THe jeep just died. Started it up, it lasted 2 seconds, and died again. Decided to try the cheap fix first, and sapped the filter. She started and choked for a minute. I cranked her again and she started right up. No problem since. Definately try the cheap fix first.

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post #7 of 7 Old 08-07-2005, 11:22 AM
paintguy
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Quote:
Originally Posted by TellyDSP
Definatley try your filter first. I went to leave Jersey a couple weeks ago and made it 100 ft from my dads driveway and broke down. THe jeep just died. Started it up, it lasted 2 seconds, and died again. Decided to try the cheap fix first, and sapped the filter. She started and choked for a minute. I cranked her again and she started right up. No problem since. Definately try the cheap fix first.



I concur ^ always start simple.
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