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94 Grand Cherokee V8 fuel problem


 
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rev-ed
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Joined: 07 Apr 2006
Location: Zanesville Ohio

PostPosted: Fri Apr 07, 2006 4:43 pm    Post subject: 94 Grand Cherokee V8 fuel problem Reply with quote

Long story short,yea right, got a hole in the fuel tank and found a replacement at junk yard. Steam cleaned all the dirt inside and out of new tank and replaced, no problem. Ran great for a day, then lost fuel pressure. Thought maybe got a little dirt in line while changing out tanks so I replaced fuel filter. Ran great for a day, then wouldn't start. Figured all right, all this moving and installing pump from tank maybe caused a failure in pump. Replaced pump ran great for a couple days, then refused to start. Thought maybe the wire connection in the wire harness was damaged where fuel pump pigtail plugs into wire harness since this is the only connection I messed with. I cut out the plug in and wired direct, making sure the right wires were matched. Next try found that it might start 1 out of 10 tries. When it starts on it own, runs great, has great fuel pressure at the rail. When it doesn't there is none there. It will run if you pour gas into the throttle body, so this is a fuel issue, most likely coupled with a wiring one. This problem only started after the tank exchange. I have even tried running a jumper wire from the pump harness to the inside of car under the rear passenger seat to where the harness comes to the interior figuring this is far enough back from where I had messed with the harness in case there is a broken wire in the harness that I am not seeing. Still no fuel pressure. I did check this pump before installing in the tank. But I am at a loss. I have recently run into another fellow with simalar problems, so if there is a veteran fuel problem warrior out there, please lets hear some input. Thanks in advance. Rev Ed
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1fox2go
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Joined: 01 Dec 2004
Location: Fishersville, Virginia

PostPosted: Sat Apr 08, 2006 5:55 am    Post subject: Reply with quote

Clogged line maybe? Im not sure of the more experienced guys will reply
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96 Cherokee 7.5 inch TnT long arm Locked F/R, D44 rear, 4.56s, 35x12.50 Muds/36x12.50 TSLs
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RussellRowell
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Joined: 09 Feb 2006
Location: Jacksonville Florida

PostPosted: Sun Apr 09, 2006 4:34 pm    Post subject: Reply with quote

I'm not a pro but I had a similar problem with my 94 JGC v-8 not keeping fuel pressure. So I put new o-rings in the fuel pressure regulator ((2) one small and one large ) and the problem was fixed. You should take yours apart and see if there's any trash in it. If there is, it could keep the check ball from seating correctly and not allow it to build pressure. Hope this helps... GL


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swamp boy
Cherokee Muderator
Cherokee Muderator


Joined: 01 Jan 2004
Location: New Orleans LA.

PostPosted: Sun Apr 09, 2006 8:16 pm    Post subject: Reply with quote

Yup.. Check that out..
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