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Old 09-20-2012, 03:22 PM   #1
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Fuel Issue

Hey everyone, new to the forums but I thought this would be the place to ask.

I have a 2000 wrangler with 108k miles. For about the last month, the jeep would not start as easily as it did. When starting, you need to crank it several times, and yesterday after not driving for a couple days it didn't start for around 30 seconds.

Would this be a fuel pump or a drain back valve?

I am also thinking of fixing this myself, and only have done oil changes and installed a short throw shifter on my mustang. Is this something I could do?
Thanks everyone

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Old 09-20-2012, 03:25 PM   #2
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Bad anti-drainback valve which is inside the fuel pressure regulator.

Replacing the fuel pressure regulator is not a technically challenging job, it does require that the gas tank be dropped though. The FPR sits on top of the fuel pump and it is readily/easily replaced once the fuel tank is on the ground so you can get to it.

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Old 09-20-2012, 03:29 PM   #3
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Wow fast response. Thanks for the info! Love your sig by the way, need more Americans like that.
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Old 09-20-2012, 05:45 PM   #4
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There is no anti-drainback valve in the fuel pressure regulator. The only valve meeting that description is in the pump assy. It is perfectly normal for fuel to flow backwards through the FPR. The problem occurs when the FPR relief valve leaks, allowing supply line fuel to leak through the relief passage; this essentially bypasses the check valve in the pump assy.
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Old 09-20-2012, 05:56 PM   #5
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Semantics, call it whatever you want to... the leaky relief valve that usually causes that problem is inside the fuel pressure regulator. Look it up in the FSM, there are actually two valves and if either leaks, fuel will drain out of the engine and into the gas tank... one in the FPR and one in the fuel pump... so call them what you like. Whether it is called a "relief valve" or anti-drainback valve, when either leaks they allow the fuel to drain back down into the gas tank so both are commonly referred to as an anti-drainback valve by those who aren't simply trying to argue.
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Old 09-20-2012, 06:10 PM   #6
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Alright. I'll try to first replace the FPR to see if that works. $100 part sure beats a mechanic putting in a new pump for hundreds more. Thanks alot for the help.
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Old 09-20-2012, 06:24 PM   #7
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Quote:
Originally Posted by AsphaltCowboy View Post
Alright. I'll try to first replace the FPR to see if that works. $100 part sure beats a mechanic putting in a new pump for hundreds more. Thanks alot for the help.
Hey boss, where did you get the 100$ part quote at? I looked at RockAuto and found the FPR for $60.. I'm debating to get the one from rock auto because I'm not sureif the FPR from rock auto is OEM or not
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Old 09-20-2012, 06:25 PM   #8
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Originally Posted by Jerry Bransford View Post
Semantics...
It's not semantics when you are on record in this forum stating that air passing backwards through a pressure regulator is a sign of a defective regulator.
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Old 09-20-2012, 06:27 PM   #9
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I'm debating to get the one from rock auto because I'm not sureif the FPR from rock auto is OEM or not
It's not OEM, but I have had very few problems with SMP parts. If you want a good price on OE, check autohausaz.
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Old 09-20-2012, 06:28 PM   #10
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I have used one of the Rockauto non-OE $60 fuel pressure regulators and it worked fine. That said the OE FPR would be a better long-term choice.
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Old 09-20-2012, 06:42 PM   #11
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I just googled the part to see how much it was. I saw it at parts geek.com (never heard of it) but its gotten good reviews. They have a mopar fpr as well although I think that's for the 4.0 wrangler.

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