Fuel Pump Help.. - JeepForum.com

 
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post #1 of 4 Old 08-10-2012, 09:28 AM Thread Starter
studer21
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1985 CJ7 
 
Join Date: Jun 2011
Location: Wilmington
Posts: 18
Fuel Pump Help..

Hi, I have been having issues ever since I purchased my CJ a couple years ago with my fuel pump. It is an electric fuel pump- Walbro I think. Anyway, it works fine all of the time unless I ever drive it at 3/4 to full throttle. The pump will stay on until I cut the jeep off. Whenever I try to restart after a scenario like that- most of the time the fuel pump doesn't cut on. I will sometimes wait an hour, or up to 5 days. Somehow, it will decide to work again and be fine until I give it 3/4 to full throttle. Really strange! I tried relieving the pressure thinking that was it for sure, nope. I have a feeling it may be voltage related or the fuel pump is just very finicky, possibly something wrong internally. I would love to get some feedback from somebody that has dealt with this or has a possible fix. Thank you guys


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post #2 of 4 Old 08-10-2012, 09:47 AM Thread Starter
studer21
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1985 CJ7 
 
Join Date: Jun 2011
Location: Wilmington
Posts: 18
I also have the MPI kit on- so it is fuel injected. Maybe the throttle position switch is malfunctioning? Just a thought I had, thanks guys

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post #3 of 4 Old 08-10-2012, 11:37 AM
1SASjeepster
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1992 YJ Wrangler 
 
Join Date: Apr 2010
Posts: 726
How much fuel pressure are you running? How much is your injection system supposed to have? That is necessary information to solve this problem. Have you put a voltmeter on the wires going to your fuel pump? Have you contacted the manufacturer about this issue? Maybe about what are the "electrical specs" for this particular fuel pump... If all else checks out, and the wiring is good and getting the proper volts/amps, change the fuel pump because it must be internal. But the manufacturer will be able to tell you if it is or not.

Did the jeep come with the MPI? I am assuming by what you wrote, no. Let me know.

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post #4 of 4 Old 08-12-2012, 10:22 PM
BagusJeep
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1981 CJ7 
 
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Location: Bali
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have you got a fuel pump relay? What is it doing during this episode?

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