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Old 10-29-2010, 02:53 PM   #1
b67cuda's Avatar
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LJ starting problem?? Help Please!!

I have a buddy with a LJ and when he bought the Jeep new it would start right up. Recently when he goes 2 start the Jeep it takes like 5 to 10 seconds to start. Has anyone else had this problem? Any Ideas of what could cause this??
Thanks - Bill

92 Wrangler 6cyl 5spd (Scrappie)
67 Formula S Barracuda Conv
59 Harley Duoglide
99 Nissan pickup
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Old 10-29-2010, 04:30 PM   #2
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I have read on here that there is a component of the fuel pump assembly that keeps the fuel from draining out of the lines back into the tank while the engine is not running. Maybe the fuel pressure regulator is what it is called. You can test it by putting a guage on the rail if equipped with a test port and see if it maintains pressure after the vehicle is shut off. The 5 second delay may be the fuel having to travel from the tank to refill the lines. Others on here can be more informative.

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Old 10-29-2010, 10:14 PM   #3
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InTheVille - Thanks 4 the reply - I did a google search and found that there is a thing called an anti return valve that does just what you were saying. Thanks again. Bill
92 Wrangler 6cyl 5spd (Scrappie)
67 Formula S Barracuda Conv
59 Harley Duoglide
99 Nissan pickup
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Old 10-29-2010, 11:37 PM   #4
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An easy way to test for a leakdown problem without tools is to "cycle" the key when cold starting.

Have your friend turn the key to the on position (not all the way to start). Wait a couple of seconds, then turn the key back to off. Do that 3 or 4 times then go ahead and start it. If the jeep then starts right up, he probably has a leakdown issue.

When the key is turned to the on position, the fuel pump activates for 2 seconds, pressurizing the fuel lines. Once a leakdown condition is diagnosed, it needs to be narrowed down between 3 possibilities: leak in the fuel line somewhere, leaky check valve in the fuel pump assembly, or one or more leaky fuel injectors. The way to do this is with a fuel pressure tester.

I ended up replacing the fuel pump assembly in my 2000 with the same symptoms.

Fixed it.
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Old 10-30-2010, 03:58 PM   #5

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If you have ruled out all the easy things you should read this thread. From my understanding it often causes no start issues. I was one of the lucky ones that had it happen while driving.

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