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Unread 08-02-2011, 10:27 AM   #1
TeeJay00
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Starting issues!!!

So my recently bought '04 4.7L WJ started to give me some trouble starting up in the past couple of days.

The jeep was in the dealership two months ago before I bought it for a complete check up and tune up by the previous owner. The starter works fine but the engine just keeps cranking and doesn't start untill I turn off the ignition and try it a second time then it starts normally with no problems at all... It appears to be a fuel pump failure symptoms!!!

What do you guys think???

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Unread 08-02-2011, 10:31 AM   #2
WiCkeDuDe
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Classic fuel pump issue. Try the fuel pump ring first before replacing the whole pump if the pump doesnt have too many miles on it.
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Unread 08-02-2011, 10:35 AM   #3
TeeJay00
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Quote:
Originally Posted by WiCkeDuDe View Post
Classic fuel pump issue. Try the fuel pump ring first before replacing the whole pump if the pump doesnt have too many miles on it.
What's the fuel pump ring???

Oh and I just remembered... One of the things I replaced when I first bought it was the fuel filler cap!!! It had a TJ filler cap which did not seal up at all !!! Now I'm thinking dirt, sand or who knows what might have gotten into the tank
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Unread 08-02-2011, 08:09 PM   #4
seankeenan
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i have the same problem. can someone help me locate the fuel filter. is it under the rear bumper? could this problem possibly be the o rings?... which i also know nothing about

my shop told me it is either a bad pump, bad filter, or bad o rings
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Unread 08-03-2011, 06:27 AM   #5
TeeJay00
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What o rings???
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Unread 08-03-2011, 12:40 PM   #6
seankeenan
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Quote:
Originally Posted by TeeJay00 View Post
What o rings???
I honestly have no idea. my mech told me it could be the o rings and they sell a kit at part stores.
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Unread 08-03-2011, 01:57 PM   #7
ChiliPalmer
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What's happening is you're losing pressure when it sits, if it's similar to the TJ then the fuel is simply flowing back into the tank so you have to crank on it to build pressure and refill the lines. On the TJ it's the anti drain back valve that goes bad so fuel pump replacement is needed but what I've read about the WJ's is that the o-ring goes bad and replacing it usually fixes the problem.

Here's a pic from the following thread that may help. It's the o-ring located inside the spring.

http://www.jeepforum.com/forum/f310/...ranks-1208967/
093.jpg  
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Oh man Chili. I feel like a recovering addict that just had a bag of blow, a bottle of Jameson, and a sack dropped in his lap. You screwed me man!
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Unread 08-04-2011, 10:04 AM   #8
TeeJay00
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Quote:
Originally Posted by ChiliPalmer View Post
What's happening is you're losing pressure when it sits, if it's similar to the TJ then the fuel is simply flowing back into the tank so you have to crank on it to build pressure and refill the lines. On the TJ it's the anti drain back valve that goes bad so fuel pump replacement is needed but what I've read about the WJ's is that the o-ring goes bad and replacing it usually fixes the problem.

Here's a pic from the following thread that may help. It's the o-ring located inside the spring.

http://www.jeepforum.com/forum/f310/...ranks-1208967/
Ok I've tried trning the key on and off to build the pressure again but it's the same thing
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Unread 08-04-2011, 10:08 AM   #9
TeeJay00
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I have been reading abot this issue which seems to be a common one in WJ's... So here is what I'm gonna do. I will replace the o ring and the fuel filter first and see where that takes me ! What do you guys think??
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Unread 08-04-2011, 07:56 PM   #10
ChiliPalmer
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That's where I would start.
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Quote:
Originally Posted by Sparrows View Post
Oh man Chili. I feel like a recovering addict that just had a bag of blow, a bottle of Jameson, and a sack dropped in his lap. You screwed me man!
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Unread 05-05-2012, 06:01 AM   #11
TeeJay00
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I'm sorry guys but I just have to bring this thread back from the grave

I still have the same long crank problem!!! I changed the O ring at first. Didn't work so i changed the whole fuel pump assembly and the fuel filter. Worked for one week and then it started to act up again

So now what??? I know it has been months since I had this problem. But I didn't have time to look into it. Now I really must fix it.
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Unread 05-05-2012, 06:12 AM   #12
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Is the problem there all the time? Because mine does it too, but only when it's warmed up and sitting for about 30 minutes or more. In the morning it starts right up, the colder the better, and if i turn it off and start it again in like 5-10 minutes it also starts without problem.
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Unread 05-05-2012, 07:05 AM   #13
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Quote:
Originally Posted by joze
Is the problem there all the time? Because mine does it too, but only when it's warmed up and sitting for about 30 minutes or more. In the morning it starts right up, the colder the better, and if i turn it off and start it again in like 5-10 minutes it also starts without problem.
The problem is there all the time. After I park it for 30min or more the fuel pressure in the lines seems to drop. Then I have to turn it on and off a couple of times until the fuel fills the lines for the engine to start normally.
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Unread 05-06-2012, 01:29 PM   #14
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Within the process of isolating the cause. Is there a fuel regulator other than the external filter in a 4.7L? Because I already replaced that when I changed the fuel filter.
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Unread 05-06-2012, 02:05 PM   #15
metalhead
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First off you need to check the residual fuel pressure with a fuel pressure gauge. If the system does not hold pressure with the engine off then there is a problem with a leaking injector fuel pump connectors, hoses or pressure regulator. This will cause hard starting issues.
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