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Topic Review (Newest First)
08-24-2011 03:52 PM
blever All I can say is ever since I flipped the rubber disk over in the bottom of the pump my Jeep starts perfectly. I just think that people should know there is more than 1 check valve and the either one can cause a problem. Mine certainly did.
08-23-2011 07:00 PM
Jerry Bransford That the first fuel pressure regulator you installed did not fix it simply means it was defective, a not uncommon thing. My first replacement fuel pressure regulator was defective too which threw me for a loop.

Out of frustration, I later removed it and tested it (blew backwards through it) and found it had been defective all along. A second replacement fuel pressure regulator fixed the problem. And at under $80 a new fuel pressure regulator is also a lot less expensive to buy than a new fuel pump.
08-23-2011 02:32 PM
blever Jerry, normally I would agree with you, but my personal experiance says otherwise. I had the long crank time and replaced just the pump. I still had the problem so I replaced the filter/regulator with a new Mopar unit and the problem continued. I took the unit out again and disassembled the plate the pump sits on. It consists of 2 socks and a check valve. The check valve has a metal washer that sits on top of a rubber disk. When the pump runs it pulls the disk up and allows fuel into the pump. When off it prevents fuel from draining out of the pump. All I did with mine was replace both socks and flip the rubber disk over. It's been starting perfectly ever since.
08-22-2011 08:10 PM
Jerry Bransford The fuel pressure regulator has the master check valve inside it. If it works, it doesn't matter if there is or is not a second check valve anywhere further down the line. Replacing the fuel pressure regulator with a good replacement will always fix the slow-start issue when it is caused by the fuel leaking back down out of the fuel rail and back into the gas tank.
08-22-2011 08:08 PM
blever Fuel pressure reg doesnt always fix this. There is a check valve in the bottom of th "cup" that the pump sits in. If it leaks down the pump will lose it's prime and take longer to start.
08-22-2011 07:52 PM
tkagad
Quote:
Originally Posted by empirepball View Post
yes i had the starting problem before i replaced the fuel pressure regulator. But i just ended up replacing the whole fuel pump which had a a the regulator on cuz still had the factory pump in it. And i am glad i did cuz the sock at the bottom of the fuel pump which was like a filter was just floating around in the gas tank. And now my jeep starts up right away so it did fix my problem.
What starting problem did you have? Also, was your fuel guage off?
08-22-2011 07:07 PM
empirepball yes i had the starting problem before i replaced the fuel pressure regulator. But i just ended up replacing the whole fuel pump which had a a the regulator on cuz still had the factory pump in it. And i am glad i did cuz the sock at the bottom of the fuel pump which was like a filter was just floating around in the gas tank. And now my jeep starts up right away so it did fix my problem.
08-21-2011 07:42 PM
Jerry Bransford
Quote:
Originally Posted by Stanton Tucker View Post
So did your jeep have this starting problem too before you bought a "fuel pressure regulator"? and if so when you replaced it did it start up just fine every time after that?
Yes, it is for that reason the fuel pressure regulator gets replaced. And yes a new fuel pressure regulator fixes that problem permanently.
08-21-2011 07:34 PM
Stanton Tucker So did your jeep have this starting problem too before you bought a "fuel pressure regulator"? and if so when you replaced it did it start up just fine every time after that?
08-02-2011 07:50 PM
Jerry Bransford
Quote:
Originally Posted by Abnmarine View Post
Taken from an earlier post by Jerry:
Yep they call it a "fuel injection pressure regulator" and they have three different models to choose from at RockAuto Auto Parts priced from $66 to $93 for the '97 TJ. I bought the mid-priced model which is working fine.
08-02-2011 03:58 PM
my98tj or you could just turn the key on (letting the fuel pump cycle), turn the key off, then turn the key and start it.
08-02-2011 03:11 PM
Abnmarine Taken from an earlier post by Jerry:

Quote:
Originally Posted by Jerry Bransford View Post
The check valve is located inside the fuel pressure regulator, which sits on top of the fuel tank. You can buy a new fuel pressure regulator for around $80 from RockAuto Auto Parts which will fix the problem which is way too common on TJs.

This is what the fuel pressure regulator looks like, I had to replace mine earlier this year for the same problem.
08-02-2011 03:00 PM
empirepball
Fuel Pressure Regulator

I went to my local dealership to day to get a fuel pressure regulator for my 97 4.0, and the guy said that I would have to buy a whole new fuel pump for $505 which I thought was ridiculous. Where can I get it or do i actually have to buy a new pump cuz i would rather deal with the long crank time till I ship out to Parris Island than have to spend $500.

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