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Old 09-13-2010, 02:54 PM   #1
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Check Valve instead of Fuel Pump??

Hello, I posted a while back about my Jeep Unlimited cranking but not starting until the thrid try. It has since been determined that it is my fuel pump. So each morning I turn the key to allow gas to flow for 2 or 3 seconds. I do this two or three times and then magic, it starts. I usually don't have any more trouble until the jeep sits for at least a day.

My question is this. A friend of mine told me he had the same problem on his Jeep Cherokee and was going to put a 5/16" Check Valve inline where the fuel feeds, before the pump so that I wouldn't have to drop the gas tank and spend lots of money for a new fuel pump. This would prevent the fuel from flowing back in.

Any opinions on this? Has anyone ever heard of this or done it? I appreciate any replies.

Thanks in advance.

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Old 09-13-2010, 02:57 PM   #2
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Dropping the gas tank is not difficult, it can be done in ten minutes. And you don't have to replace the fuel pump to replace the check valve. The check valve is inside the fuel pressure regulator located on top of the fuel pump.

I would MUCH rather replace that than cut the fuel line, insert a check valve, and then hope it doesn't leak afterwards.

Here's a pic of the fuel pressure regulator taken when I replaced mine a few months ago. It is held onto the top of the fuel pump by that snap-in flat spring steel clamp you see on top of the old pressure regulator.
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Old 09-13-2010, 03:00 PM   #3
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Someone tried this a while back and the pressure kept blowing the line off and when the got that to stop it started making other lines leak in other places. You can buy the fuel pressure reg which is where the check valve lived for like $70 but you still have to drop the tank to get to it. Mine does the same thing, I just crank, release, and crank again. I think of it like I am preoiling the system before it starts.
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Old 09-13-2010, 05:18 PM   #4
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So Jerry, did you have the same symptoms? Did replacing the regulator fix it?

I have this problem with mine and had decided to just replace the regulator, but have heard from a couple people there is another check valve inside the pump and therefore the whole pump needs to be replaced. I was told just replacing the regulator did not fix this problem.

I'm not sure whether to spring for the whole pump now.

Thanks in advance!
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Old 09-13-2010, 05:50 PM   #5
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While replacing the fuel pressure regulator is usually "the" fix for this problem, it didn't fix my starting problem. Having checked everything else including my fuel injectors for leaking, I am highly suspicious that I received a defective (leaky) fuel pressure regulator. The other check valve is inside the fuel pump but the primary check valve is the one inside the fuel pressure regulator which is, by itself, responsible for maintaining fuel pressure between it and the fuel injectors that are upstream of it.

I should have checked the new pressure regulator's check valve before installing it but I never dreamed there might have been something wrong with it. My heart sank when after all that work, the problem remained after the new regulator was installed. But with nothing else leaking that I can find between the fuel injectors and check valve, I do think I must have gotten one that was defective so I'm gonna try it again. Or maybe I'll chicken out and just buy the whole assembly... fuel pump, fuel pressure regulator, and gas gauge sender, in spite of theory saying it could only be the fuel pressure regulator's internal check valve. Especially since my gas gauge is WAY off anyway.
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Old 09-13-2010, 06:55 PM   #6
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I must say that jeep installed some damn fine starters in these things.
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Old 09-13-2010, 08:36 PM   #7
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Thanks Jerry!
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Old 09-14-2010, 01:40 AM   #8
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Thanks folks, This is the type of feedback I was hoping to get. Hopefully more folks will chime in with their experiences.
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Old 09-14-2010, 01:51 PM   #9
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Unhappy

im having similar starting issues with my jeep and im thinking its the regulator as well but whati dont understand is that if my jep turns over for a while and then starts and sometimes sputters to a start why would my throttle body be so black and why would it sometimes smell like its burning a ton of fuel on start up? any thought would be very helpfull. and how do u check a leaky injctor? if that were the issue

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