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Old 11-09-2009, 01:32 PM   #1
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fuel problem... check valve?? '94 4.0

I am having a fuel problem in my 94 wrangler 4.0. I recently replaced the fuel pump and filter, located in the tank. Since then, the jeep is very slow starting. This only happens if its been sitting for 15 minutes or so. I feel like the fuel is running back towards the tank when its off. I have been told that there is a check valve on or around the fuel pump that could be causing this. I cant find a replacement for this valve, is there another valve i could use or am i screwed??? and where exactly is this valve located?

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Old 11-09-2009, 02:03 PM   #2
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would it also be possible for me to put an in-line check valve to keep myself from having to remove the tank again? I have also replaced the fuel pressure regulator up by the rail...

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Old 11-09-2009, 03:38 PM   #3
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I thought there was a valve by/on
the regulator on the rail
from other posts
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Old 11-09-2009, 07:06 PM   #4
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It is probably worth your time to check very closely for leaks. If you don't park in a garage, you could have a very small leak that isn't noticeable.
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Old 11-09-2009, 07:16 PM   #5
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And in case it helps, I did just take a look at my old pump, and I can't blow air back in the outlet. I suppose you could have gotten a bad pump.
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Old 11-09-2009, 07:19 PM   #6
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Did you put both clamps on the pump and tube? I forgot once and only put the 1st one. It would loose pressure over time.

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