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Unread 10-11-2013, 08:24 PM   #1
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Join Date: Feb 2004
Posts: 21
Fuel pump or filter????

Have a fairly loud "whine" coming from what sounded near the rear...did not change with engine RPM in neutral, and was there only at idle...as I accelerated it went basically away..

The engine shows no slow starting, no long cranking...no impact on performance, acceleration, etc...can't really tell MPG because it hasn't been that long. When the car starts, it takes a few seconds for the noise to show up, and when you accelerate it really dies down in volume. It is there about 90% of the time. I had done a Seafoam treatment several weeks ago...and I'm still not convinced that is the culprit,

The car is a 4.7HO with only 83K on it. The noise definitely is coming from the fuel pump area and not the filter, but from what I've read here a blockage in the filter area could cause a pressure backup to the pump to make it whine. I'm just trying to make sure which to change (Filter or pump)???? My pro mech friend says it's the pump and if I had some filter blockage it would show up in performance...and I'm inclined to agree...

Pump or Filter???

banshee74 is offline   Reply With Quote Quick reply to this message
Unread 10-11-2013, 10:33 PM   #2
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2003 WJ 
Join Date: Jun 2009
Location: , Indiana
Posts: 561
Never really heard a WJ with a loud pump, but my dads MJ has a very loud one. Could be that..

I have heard the wix WJ fuel filters can get rather vocal at about 5000 miles of usage as well.
03 WJ Laredo 4.Sl0w
2" BB, Duratracs
dlundblad is offline   Reply With Quote Quick reply to this message
Unread 10-11-2013, 11:06 PM   #3
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1999 WJ 
Join Date: Oct 2013
Location: Round Rock, Texas
Posts: 45
Although it sounds like the pump to me, I'd change the filter first because it's WAY easier to do. If that don't fix it, either just live with it (if the fuel rail pressure is good) or drop the tank and swap that sucker out. I just swapped out a dead pump on my rusty WJ, and it was a Royal PITA. It took a whole can of PB Blaster, my longest breaker bar (and a pipe), M12x1.75 tap, new bolts, three trips to the parts store, an old pillow, and a 6'1" arm-span to disconnect the fuel lines with a fuel tank laying on my belly under the Jeep.

Yeah, can't wait 'til my son is old enough to be my helper.
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Unread 10-11-2013, 11:58 PM   #4
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2002 WJ 
Join Date: Dec 2004
Location: Irvine, CA
Posts: 883
My filter regulator will whine occasionally. I run some Marvel Mystery Oil in a tank of gas and it's gone for a while. Not sure if the WIX filter whines when it picks up junk in the fuel or if I just have a noisy one. Try some in the tank and see if it clears up since it's easy to do. I get better mileage with it in the tank but I know results vary depending on the Jeep.
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