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Old 07-28-2009, 10:19 PM   #1
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Starting Issues

My jeep is giving me some trouble starting from a cold start. If the motor has been sitting for a couple hours and I go to drive it, it will crank for 5-7 seconds but wont start. I turn the key back to release and then turn it back to start and it fires right up. Over the weekend I dropped the gas tank and changed my float, so I'm thinking maybe its a fuel pump issue??? Any help is greatly apprciated. Thank you.

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Old 07-30-2009, 04:23 PM   #2
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Try turning the ignition on (but not to start) for a few seconds. Then turn it to "off" and try to start it. Can you hear the fuel pump running? Does it start when you try it a second time?

Sounds like your fuel pressure regulator might not be holding pressure in the line while the Jeep is sitting. Does it run okay once it's started? The fuel pressure regulator sits on top of the fuel pump. Mine went bad at about 65,000 miles. I got one from the dealer for $118 and replaced it myself. Solved all my starting problems.

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Old 08-02-2009, 09:59 AM   #3
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Yes mine starts fine the second time and runs fine once it is started. A technician at my work looked up the problem on identifix and they said to replace the o-rings in my fuel pump cause thats what causes it to lose pressure once turning the car off.
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Old 08-02-2009, 10:46 AM   #4
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Originally Posted by DBLee View Post
Yes mine starts fine the second time and runs fine once it is started. A technician at my work looked up the problem on identifix and they said to replace the o-rings in my fuel pump cause thats what causes it to lose pressure once turning the car off.
You can rebuild the fuel pump on these? I thought it was a sealed unit that once something went wrong with it, it was trash?
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Old 08-02-2009, 10:57 AM   #5
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The fuel pump itself is not rebuildable though it's possible the o-rings where the fuel lines connect coul be bad. More likely however is the anti-drainback valve inside the fuel pressure regulator that sits atop the fuel pump is leaking. When it leaks, it allows all the fuel that is supposed to remain in the fuel rail next to the fuel injectors to leak back down to the fuel tank. The long start is how long it takes for the fuel pump to get the fuel back up to the fuel rail/fuel injectors.

You can often find the TJ's fuel pressure regulator sold separately on eBay. At the dealer, you can only buy it as part of the fuel pump which is a lot more $$$.
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Old 08-02-2009, 01:33 PM   #6
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I bought my fuel pressure regulator separate from the fuel pump at the dealer without any problem.
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Old 08-02-2009, 02:22 PM   #7
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Originally Posted by BlackJeepoftheFamily View Post
I bought my fuel pressure regulator separate from the fuel pump at the dealer without any problem.
That's welcome news, my parts guy at the dealer told me several years ago they only came as an assembly and the regulator wasn't available separately.

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