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Old 08-14-2009, 09:27 AM   #1
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fuel pump / fuel filter etc questions

like many, my jeep doesn't start right away, the one way valve is most likely the problem. also the idle is not perfect, every 10 / 15 sec it will " miss" .

questions: is the valve thing part of the fuel pump or separate and can be bought and installed without removing the pump.
fuel filter, is it somewhere on the fuel line or in the tank or part of the fuel pump?
where can i buy what i need? the jeep being a 98 should i just replace everything ?

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Old 08-14-2009, 09:37 AM   #2
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like many, my jeep doesn't start right away, the one way valve is most likely the problem. also the idle is not perfect, every 10 / 15 sec it will " miss" .

questions: is the valve thing part of the fuel pump or separate and can be bought and installed without removing the pump.
fuel filter, is it somewhere on the fuel line or in the tank or part of the fuel pump?
where can i buy what i need? the jeep being a 98 should i just replace everything ?
fuel filter is it on the fuel line
With our 98's our fuel filter is supposed to be a "Life time" filter that is attached to the bottom of the fuel pump assembly. We don't have a Inline fuel filter at least mine doesn't.

This is the factory filter that attaches to the bottom of the pump. The new filter that comes with a new pump is about three times bigger. From what I have read when I was researching the same problem the valve you are looking for is under the hood near the fire wall. It's been a few months so I may be mistaken. I stopped having issues with mine when I replaced my old pump. The filter was clogged up pretty good on the inside. Mine had 100k on the pump and the sending unit was bad. The guy I bought it from claimed the sending unit went bad because it sat a lot and built up gunk on the sending unit. When I pulled it the board that it rubs on was just worn out.


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Old 08-14-2009, 09:42 AM   #3
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my jeep as 135k miles.... where did you get the pump from?
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Old 08-14-2009, 09:45 AM   #4
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With our 98's our fuel filter is supposed to be a "Life time" filter that is attached to the bottom of the fuel pump assembly. We don't have a Inline fuel filter at least mine doesn't.

This is the factory filter that attaches to the bottom of the pump. The new filter that comes with a new pump is about three times bigger. From what I have read when I was researching the same problem the valve you are looking for is under the hood near the fire wall. It's been a few months so I may be mistaken. I stopped having issues with mine when I replaced my old pump. The filter was clogged up pretty good on the inside. Mine had 100k on the pump and the sending unit was bad. The guy I bought it from claimed the sending unit went bad because it sat a lot and built up gunk on the sending unit. When I pulled it the board that it rubs on was just worn out.

What you're holding is the fuel pump inlet filter found at the bottom of the pickup tube which is only there to keep the big stuff out. That's not the Jeep's primary fuel filter. The actual fuel filter is inside the fuel pressure regulator located on top of the fuel pump and it's made from a very dense white material that looks kind of like a big round cylindrical shaped piece of felt. It's physically fairly large and has an immense surface area which is what gives it its lifetime ability.

Loic, you can buy the fuel pressure regulator assembly which contains the one way anti-drainback valve separate from the fuel pump.
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Old 08-14-2009, 09:46 AM   #5
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my jeep as 135k miles.... where did you get the pump from?
Think we talked about this in your last thread. You can buy the pump from any of the Chain part stores. Autozone, Napa, etc, etc. Mine is a Airtex and have not had any issues with it YET but a lot of people have so I would avoid it. Too expensive to risk having it break down few months down the line and them not take it back and say it failed because of "User installation error" or something along those lines.
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Old 08-14-2009, 09:50 AM   #6
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Loic, you can buy the fuel pressure regulator assembly which contains the one way anti-drainback valve separate from the fuel pump.

Is this what you are talking about? Is that the fuel pressure regulator or is that the real fuel filter?

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Old 08-14-2009, 09:56 AM   #7
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Yes, the main fuel filter is located inside the fuel pressure regulator module, that can with the red 'X' on it.
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Old 08-14-2009, 09:58 AM   #8
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Yes, the main fuel filter is located inside the fuel pressure regulator module, that can with the red 'X' on it.
Great! Now I know what I was taking my anger out on when I couldn't get the pump to sit down in my tank right.

Wonder what vehicle I was reading about that had the pressure reg on the fuel rail under the hood.
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Old 08-14-2009, 11:09 AM   #9
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cool, thanks for the info. how much time would it take me to replaced it myself? any seal/ rings that need to be replaced at the same time?
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Old 08-14-2009, 12:11 PM   #10
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It is only a matter of dropping the fuel tank (get it as empty as possible first) to get to the fuel pressure regulator. It doesn't take long to drop the fuel tank, 15-20 minutes or so. The new regulator should come with any o-ring it requires.
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Old 08-14-2009, 02:29 PM   #11
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cool, thanks for the info. how much time would it take me to replaced it myself? any seal/ rings that need to be replaced at the same time?
Do it while it is warm out because the tanks tend shrink when it is cold and a extra set of hands help. If you don't run into any snags if you are replacing the entire pump hour or so.
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Old 08-14-2009, 05:17 PM   #12
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like Vegas warm ? lol
thx for the inputs !

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