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Unread 05-17-2012, 06:12 PM   #1
philxphil
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1993 YJ Wrangler 
 
Join Date: Jul 2011
Location: Colorado Springs, CO
Posts: 61
Fuel pump electrical problem...

Been searching through the forums and I have a few tests I'm going to run through this weekend but I was wondering if anyone else might know what is going on here. Jeep starts up fine and I can drive a random distance, anywhere from 1 to 15 miles, and then the jeep will stall. I pull over on the side of the road, try to start the jeep back up but it won't go. I hop out, unplug the fuel pump wiring harness and then plug it back in and then the jeep starts right back up. I can drive another few to 10 miles and then the same thing happens. Why would unplugging the wiring harness at the fuel pump and then plugging it right back in give me a temporary fix? Doesn't look like anything is corroded and the connection seems fine. Any ideas?

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Unread 05-19-2012, 07:25 AM   #2
philxphil
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1993 YJ Wrangler 
 
Join Date: Jul 2011
Location: Colorado Springs, CO
Posts: 61
No one has has any ideas?
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Unread 05-19-2012, 08:13 AM   #3
Leafs
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1993 YJ Wrangler 
 
Join Date: Dec 2010
Location: Henderson, NV
Posts: 9
Quote:
Originally Posted by philxphil
No one has has any ideas?
Crowbaring Fuel pump relay perhaps. Could be Vapor lock. Maybe, in the time it takes you to reconnect the pump connection the pressure in the tank equalizes. Have you put a DVM on it to see if you are actually losing voltage at the pump? Will need to be done without unplugging it of course.
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Unread 05-19-2012, 08:40 AM   #4
philxphil
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1993 YJ Wrangler 
 
Join Date: Jul 2011
Location: Colorado Springs, CO
Posts: 61
Quote:
Originally Posted by Leafs View Post
Crowbaring Fuel pump relay perhaps. Could be Vapor lock. Maybe, in the time it takes you to reconnect the pump connection the pressure in the tank equalizes. Have you put a DVM on it to see if you are actually losing voltage at the pump? Will need to be done without unplugging it of course.
What do you mean by crowbaring the fuel pump relay? I swapped the relay with the horn relay and it seemed to work, but that fix was short lived. Would the vapor lock be an issue with the seal between the tank and the sending unit? I replaced that seal less than 6 months ago along with an entirely new sending unit/pump. As far as the DVM goes, I bought one but honestly have no experience using one and I'm lost as to where/how to start using it in figuring out my fuel pump problem.
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