1993 YJ fuel sender is not priming - JeepForum.com

 
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post #1 of 7 Old 09-06-2013, 02:33 PM Thread Starter
pbmustache
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1993 YJ Wrangler 
 
Join Date: Sep 2013
Location: Newark
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1993 YJ fuel sender is not priming

Hello everyone. I'm a new jeep owner of one week. I have a 1993 Jeep Wrangler Renegade. The jeep was my sister-in-laws which sat for a year and a half before I took ownership. (I was sad looking at it all lonely)

Now for my starting issue. When I got the vehicle I had some minor repair work done prior to me brining it home. Once I got home I noticed that the vehicle would intermittently not start, I would crank but not turn over. There was no specific time when this would happen, Very random. I did some research and ending up replacing the Crank position sensor. The Jeep fired right up. But now I think I'm fighting a twofold issue. In the morning after the vehicle has sat overnight the sending unit doesn�t prime the line for start-up. This seems to happen only in the morning (moisture?) If I let it sit as the day warms I hear the sender turn on prime the line and it starts right up and runs great. I checked for codes and found 12 battery disconnected in the last 30 days and 55 end of fault codes. All of the gauges work and runs like a champ once it starts. Does anyone have any idea on what the issue could be? At first I thought it maybe the sending unit but the more I thought about it, it almost seems to be electrical, chaffed wire? I also replaced the Fuel pump relay and I do hear that engaging in the morning.

Thanks for the help!!

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post #2 of 7 Old 09-06-2013, 06:17 PM
jokerchief462
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1989 YJ Wrangler 
 
Join Date: Nov 2010
Location: Sin City
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Does the check engine light come in first try in the morning???

If it is temp related could be a couple of things.

Grounds in the engine passenger side of the block about three important ones. You should be able to locate then very easy. Disconnect and clean with wire brush green scouring pad.

That is the first place to start.

Welcome to the forum make sure to go an put info into your profile page this will help others answer your questions.

See how that works and get back and see what is next.

Sent from underneath my Jeep

89YJ 2.5L TBI, AX-5, NP231 SYE, Ford 8.8, Yukon Grizzly, Tom Woods Shaft, 33" BFG T/As, 4" lift, Warn VR10000s.

AF Jeep Club Tail #184
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post #3 of 7 Old 09-06-2013, 06:54 PM Thread Starter
pbmustache
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Thanks, yes my check engine light does come on. I have not checked any grounds but I will.
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post #4 of 7 Old 09-06-2013, 07:35 PM
Why J?
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Quote:
Originally Posted by pbmustache
Thanks, yes my check engine light does come on. I have not checked any grounds but I will.
What code you getting?
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post #5 of 7 Old 09-07-2013, 05:23 AM Thread Starter
pbmustache
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Quote:
Originally Posted by Why J?

What code you getting?
12 and 55
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post #6 of 7 Old 09-09-2013, 07:28 AM
Que89YJ
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I see you did post your own thread! Great! You definitely have the right idea. Check the fuel pressure and see how long it takes to bleed down. Also check the temp sensor on the thermostat housing. When the engine is cold it is the primary input for the ecu calibration.
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post #7 of 7 Old 09-10-2013, 01:49 PM Thread Starter
pbmustache
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Ok, good news I put a new auto shut down relay in and this morning it started. First time it started In the morning since I had it. It was a little hard to start and I do have a slight fuel leak at the fuel filter line. I should have the part tomorrow an I'm planning on testing the fuel pressure this weekend just to make sure it's on par. I may through in a new temp sensor for good measures!
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