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post #1 of 4 Old 08-21-2004, 03:24 PM Thread Starter
miataeric
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1998 ZJ 
 
Join Date: Jul 2004
Location: Pompano Beach, FL
Posts: 28
Starting problem

My jeep never starts on the first try. I used to crank it two or three times to get it going. Now I just turn the key to the "on" position and wait for the pump to run. I do that two or three times before I crank it. When I do that, it starts right away.

I'm hoping the problem is not in the pump module since I don't want to remove my gas tank or cut a hole in my floor. If it is the pump, I'll just do the Swampy Bypass while I have it all apart. Why did they put the pump in the tank in the first place?


Stock 1998 ZJ 4.0 w/ Select-Trac
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post #2 of 4 Old 08-22-2004, 07:54 AM Thread Starter
miataeric
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1998 ZJ 
 
Join Date: Jul 2004
Location: Pompano Beach, FL
Posts: 28
Could there be a leak between the pump and the injectors causing pressure to drop off once the car sits (turned off) for a while? If you turn it off and back on again quickly, it starts right up.

Stock 1998 ZJ 4.0 w/ Select-Trac
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post #3 of 4 Old 08-22-2004, 01:20 PM Thread Starter
miataeric
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1998 ZJ 
 
Join Date: Jul 2004
Location: Pompano Beach, FL
Posts: 28
Numbers

I've got more information now. I tested the fuel pressure and these are my results:
If I turn on the pump (put key in ON position): 15psi, dropping very quickly to 0.
If I turn the pump on twice (On - Off - ON): 30psi, dropping very quickly to 0.
If the car is idling, 50psi which is within the normal operating range.

Any ideas?

Stock 1998 ZJ 4.0 w/ Select-Trac
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post #4 of 4 Old 08-22-2004, 01:34 PM
driabyor
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1994 ZJ 
 
Join Date: Apr 2004
Location: chilton-haynes<$20
Posts: 2,450
there is a one way valve but location unknown most likely on pump.... and probably not serviceable... i guess you can add one inline by the filter.....

or just wait a few seconds before you try to start it each time....

you know turn key on then fasten your seat belt then start the jeep
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