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Old 04-18-2013, 09:24 AM   #1
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Fuel pressure Check Valve woes...

Hello everyone.. I am new to the Jeep world... I cannot wait to post my the story of my new TJ.. but before I can do that....I need help..

I have been suffering from the drain back issue with my fuel once the car has been turned off.. goes to zero immediately..

Replaced my FPR.... didn't make a difference.. learned about the blow through test.. tested old one failed, removed new one - failed, went to advance auto - tried everyone they had - all failed, bought one from NAPA, failed... bought one from the dealer, failed.... Just got one in from Rock Auto - failed..

PLEASE HELP ME! Where can I get one that works? Anyone know a vendor that will test befpore shipping? DOes someone have one to sell.. please I just want to drive my JEEP......., and please don't tell me just prime the pump etc.. I know that.. I just want a part that works... I am not a corner cutter...

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Old 04-18-2013, 09:37 AM   #2
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I used to believe you could test a FPR by blowing through it but you can't, it needs a more viscous fluid for the valve to work. I have had several FPR failures & at least one bad FPR right out of the box but you won't know if the FPR is good or bad until after it is installed.

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Old 04-18-2013, 09:39 AM   #3
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Thanks Jerry...

I have been reading posts on dozens of topics that you have replied about..
It is extremely appreciated...

I guess I have to go try one of the many I have down stairs! Which brands have you been successful with?
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Old 04-18-2013, 09:41 AM   #4
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I can only say that Airtex is one of the brands I wouldn't go with. It's real hard to beat the OE FPR, that is for sure.
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Old 04-18-2013, 10:08 AM   #5
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Quote:
Originally Posted by wolny10 View Post
learned about the blow through test.. tested old one failed, removed new one - failed, went to advance auto - tried everyone they had - all failed, bought one from NAPA, failed... bought one from the dealer, failed.... Just got one in from Rock Auto - failed..
What has failed is your understanding of how the FPR works. There is no check valve in the FPR; its in the fuel pump. That is why you cannot test the FPR itself by blowing through it. The typical reason for the leak-down is that a 5 cent rubber seal on the relief valve starts to leak.

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I used to believe you could test a FPR by blowing through it but you can't, it needs a more viscous fluid for the valve to work.
Completely untrue.
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Old 04-18-2013, 11:07 AM   #6
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According to Shop Key/ Mitchell On Demand, it's a "fuel pump outlet check valve" and the regulator is just the regulator and fuel filter.
I always replace the module assy. which includes the regulator so I can't personally say I know exactly where the check valve is.
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Old 04-18-2013, 03:41 PM   #7
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Can said o-ring be changed?

Or do I need to change the whole assembly?

I thought there were 2 check valves...

One in the pump and fpr?
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Old 04-18-2013, 04:15 PM   #8
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I always replace the whole module. That being said, if I knew the pump itself wasn't very old, I might just replace the regulator if that's all it needs. The general consensus on Jeep forums has been that the check valve is in the regulator, but, as I stated, my diagnostic software states that it's a "fuel pump outlet check valve", which insinuates that it's in the pump itself. So, I don't know from personal experience whether there's one valve, two valves, or where exactly they're at. I'll bet you I'll find out for sure now, though.
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Old 04-18-2013, 04:54 PM   #9
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I thought there were 2 check valves...

One in the pump and fpr?
You are mistaken. There is no check valve in the FPR. I am 100% sure of it. The is one valve in the FPR-the pressure relief valve. It's essentially a bypass valve, not a check valve. When it leaks, it bypasses when it should not. But it in no way prevents reverse flow through the FPR.
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Old 04-30-2013, 03:39 PM   #10
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Thanks for the info - New unit!

Thanks for everyone's insight.

I changed the whole unit with a Bosch unit..

Wow, what a difference... much smoother and normal starts!
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Old 06-05-2013, 12:08 AM   #11
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May I ask where you bought the Bosch unit an its price?

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