Hissing noise

MikeD0106 · **Posted:** Fri May 15, 2009 10:43 am

I've done some searching, but haven't found anything specific. If I'm missing something then please let me know...

To the rear of the Liberty there is a hissing noise when it idles. Now I've "assumed" that it is the fuel pump being that there is nearly 150k on the vehicle. The noise started some time ago & has progressively gotten worse. I've just been procrastinating on getting anything done about it.

Does this sound like it might be right or is there something else I should be checking?

Thanks

Neatus · **Posted:** Fri May 15, 2009 11:22 am

Check all the hoses around the gas tank. After a while some of the vacuum lines crack. They might look okay but put your hands on them and feel for moving air. I have had this problem before exactly as you describe.

Blue KJ in PA · **Posted:** Fri May 15, 2009 11:29 am

Yeah I had something replaced back there a few years ago now so I don't remember what it was...rear evap condenser maybe...

MikeD0106 · **Posted:** Sat May 16, 2009 12:26 am

Thanks guys... I will get under her this weekend...

jnaut · **Posted:** Mon May 18, 2009 3:56 pm

Throwing any codes? Wouldn't a leaking evap cannister throw a code?

MikeD0106 · **Posted:** Mon May 18, 2009 4:10 pm

I guess that's a possibility, but no codes have shown & this has been ongoing for some time now... It hasn't harmed performance or mileage so I never really messed with it, but now its just getting to be very annoying...

myjeepwalks · **Posted:** Tue May 19, 2009 4:27 pm

Mine does the same thing. I've narrowed it down to the fuel pump. It's been doing it since i got it at 44k miles. It now has 128k and hasn't gotten any worse. :wink:

MikeD0106 · **Posted:** Tue May 19, 2009 7:40 pm

Haha... Yea, mine has gotten louder as time passes, but still seems to be working just fine. I'm just at the point that it is EXTREMELY annoying so I want it to go away...

Xodius · **Posted:** Wed May 20, 2009 4:24 pm

lol, mine does the same thing. I thought mine was just a loose exhaust pipe fitting somewhere. Mine is a bolted on Catback. I just ignore mine

I ignore a lot of noises on my KJ. It is a jeep after all and they are suppose to be noisy. LOL. If you figure out what it is let me know...maybe I will take a look at mine. I am going to swap out the rotors this weekend along with new pads of course. Tired of the shaking when I slow down.

FreedomKJ · **Posted:** Thu May 28, 2009 3:40 pm

Anyone manage to pin this down to a specific part?

I've had the hissing for a while, but I didn't really notice it until someone else pointed it out. At that point I wasn't sure if it was a noise the Jeep had always made or if it was something new.

Anyway, it's pretty annoying now that I know it's there and I'd like to fix it.

MikeD0106 · **Posted:** Thu May 28, 2009 6:12 pm

Well, I checked out the vacuum lines when I had the Jeep up in the air this weekend & could not find any leaks or damage... Unless someone has a better idea I think that just leaves the fuel pump.

Hissing noise

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