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  #1  
Old June 7th, 2012, 18:01
jeepkid03 jeepkid03 is offline
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Fuel Check Valve

So lately my 2000 has been taking a little longer to start after sitting over night. It usually takes two quick tries to start it, or one long crank. When sitting for only a short bit it will fire up quickly like always. Plugs are good, and the issue only happens after it has been sitting a while. I'm pretty sure it is the common fuel check valve issue on 97+. I know this check valve is located in the tank, but is it part of the fuel pump? I checked RockAuto.com for just the check valve and didn't have much luck.

Thanks!
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Old June 7th, 2012, 19:14
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Sidewinder CC Sidewinder CC is offline
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Re: Fuel Check Valve

It is part of the fuel pump module.
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Old June 7th, 2012, 19:34
jeepkid03 jeepkid03 is offline
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Re: Fuel Check Valve

Quote:
Originally Posted by Sidewinder CC View Post
It is part of the fuel pump module.
Thanks! Any recommendation on what brand to buy? This is something I'd like to do only once.
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Old June 7th, 2012, 20:06
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Tim_MN Tim_MN is offline
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Re: Fuel Check Valve

Buy a Bosch. Never buy an Airtex.
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I'm starting to realize people on the Jeep forums are highly expert mechanics .....
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  #5  
Old June 8th, 2012, 03:50
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birchlakeXJ birchlakeXJ is offline
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Re: Fuel Check Valve

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Originally Posted by Tim_MN View Post
Buy a Bosch. Never buy an Airtex.
Better advice has never been printed!!

There are two check valves. One on the regulator and one on the fuel pump. As your problem could be either and because you have to drop the tank, I always recommend replacing the entire ASSEMBLY.
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Old June 8th, 2012, 07:32
jeepkid03 jeepkid03 is offline
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Re: Fuel Check Valve

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Originally Posted by birchlakeXJ View Post
Better advice has never been printed!!

There are two check valves. One on the regulator and one on the fuel pump. As your problem could be either and because you have to drop the tank, I always recommend replacing the entire ASSEMBLY.

Wait so both check valves are in the tank? Or is there one on the fuel rail? Definitely buying a Bosch, thanks Tim!
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Old June 8th, 2012, 07:59
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birchlakeXJ birchlakeXJ is offline
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Re: Fuel Check Valve

Both check valves are INSIDE the tank and are part of the fuel pump "assembly". One check valve (primary) is on the regulator and the other is on the fuel pump itself.
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Old June 8th, 2012, 11:43
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heyhar heyhar is offline
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Re: Fuel Check Valve

And, please, do not add an external check valve. I was tempted a few years ago, and it was explained that from '96 on, there's no regulator or return on the rail, just a supply. Park with a hot engine, and the gas in the rail wants to expand, and the new check valve won't let it back into the tank. Not good!. I ran a can of BG44k through the tank, and maybe I'm dreaming, but it behaves fine again! And I can run 87 octane gas again, without the ping I was getting. No, I'm not a salesman for BG, but I always keep some on hand, and my JEEP and Subie OBW don't ping anymore!
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Old June 9th, 2012, 06:18
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Original_MudButt Original_MudButt is offline
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Re: Fuel Check Valve

One check valve is inside the pump, inside tank. The other is on top of the pump, outside of the tank.

The one outside the tank sits atop the pump assembly. It's actually a filter, pressure regulator and check valve all in one.


You still have to drop the tank. But there is a simple strap that you pop off, then pry the FPR out. There is an o-ring that seals it also. A new o-ring should come with the FPR.

I bought mine from Morris 4X4 two years ago and have no problems with it.

All that being said, there are tests to be done to determine if it is the check valve or a leaky injector.
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