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Old 07-27-2013, 10:15 PM   #1
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Jeep won't start!!

Hello everyone, I'm looking for some possible troubleshooting ideas with my situation. I own a 94 Jeep YJ and recently drove it on a trip to visit some family in Philadelphia 420 miles away. Well everything ran smoothly until 2 days after arriving, I went to start my Jeep and it cranked all day but no start. well I let it sit with the key turned for battery power to flow and then tried again. The Jeep struggled but it started. I heard this is a common problem with the anti drain back valve located on top of the gas tank. Does this sound right or is there another issue it could be? The Jeep acts like it isn't getting any gas. I checked my spark plugs and wires and they looked decent. After arriving home from my trip I havn't driven the Jeep in two days and now tried to start it with my same method and it just crank. Please help!

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Old 07-27-2013, 11:27 PM   #2
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Sounds like the fuel pump is losing its prime. That's the valve your talking about.

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Old 07-28-2013, 01:13 PM   #3
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That's what it sounds like, but the anti-drain back valve is located up on the fuel rail, just before the line of injectors. You are thinking of the roll over valves that are on top of the tank. I have never seen any valves on the gas line itself near the top of the tank.

But for the long run, if its losing its prime, then that's the sign of a weak pump. or a clogged or semi clogged pick-up tube on the pump in the tank. Even if the valve was bad, it should start with 2-3 cycles of the key if the pump was performing as it should.
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Old 07-28-2013, 10:09 PM   #4
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Thanks for the input, I got it started today after 5 minutes of continually trying but normally I hear the full pump activate when I turn the key forward and now it no longer does this so I have reason to believe that my problem is the fuel pump. Is there a writeup anywhere on replacing this? And can I simply replace the fuel pump without replacing anything else? Thanks!
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Old 07-28-2013, 10:55 PM   #5
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Here is a link to a picture of the check valve I was talking about:
Buy Airtex Flow Check Valve CV8000 at Advance Auto Parts

I would hate to get a new fuel pump if this valve is the only problem, not sure what to do...
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Old 07-28-2013, 11:02 PM   #6
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If you think that's bad, I say go for it. It's cheaper than the pump that's for sure.

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