pktzygt Posted April 6, 2009 Share Posted April 6, 2009 I might just have never noticed it before, but I definately heard a hissing sound. I am getting awful gas mileage. Like 10mpg. I'm on 32" MT's and wasn't exactly getting great mileage before. I think my cat is toast and have a magnaflow on order and will be repairing an exhaust leak at the y-pipe gasket at the same time. I checked the trouble codes today and got nothing. I recently did a body lift, but the new longer fuel filler hoses seem to be intact and installed properly. I see no fuel leaking. Well, not that everyone knows that my truck is a big 'ol POS. Could this be contributing to the bad mileage? Do you know if it's normal? Is it the fuel pump? I'll probably have to get the cat on and find out. I was hoping to figure out something before I get the cat on so I don't kill the new on too. P.S. For those card carrying PETA members, I don't really kill cats. Link to comment Share on other sites More sharing options...
SteeevO Posted April 6, 2009 Share Posted April 6, 2009 Mine has a hissing sounds as well. It's most likely your fuel pump. Link to comment Share on other sites More sharing options...
Precise1 Posted April 6, 2009 Share Posted April 6, 2009 X2 Perhaps your cat is clogged, but I don't know how to test for it. Try cleaning your MAF and if it runs rich (smell exhaust, check the plugs) your O2 sensor may be failing; they don't always throw a code... B Link to comment Share on other sites More sharing options...
pktzygt Posted April 6, 2009 Author Share Posted April 6, 2009 Mine has a hissing sounds as well. It's most likely your fuel pump. Normal fuel pump sound that i never noticed before? Or fuel pump that has issues? I have been patiently awaiting the cat to get here in the mail. I'll check mileage and look at o2 sensors next probably. Link to comment Share on other sites More sharing options...
Precise1 Posted April 7, 2009 Share Posted April 7, 2009 Normal fuel pump sound that i never noticed before? Or fuel pump that has issues? I have 2 95XEs, both have a hissing noise that is the fuel pump and both run fine, the pumps aren't failing from what I know. B Link to comment Share on other sites More sharing options...
SteeevO Posted April 7, 2009 Share Posted April 7, 2009 mines been doing it for atleast 2 years that i know of.. it's kinda funny because people on the trail will be like.. WAIT! your tire is leaking air! Link to comment Share on other sites More sharing options...
beavis0076 Posted April 7, 2009 Share Posted April 7, 2009 Mine does it too! I didn't notice it till one day, and I thought something was wrong.... still runnin fine...... Link to comment Share on other sites More sharing options...
Kingman Posted April 7, 2009 Share Posted April 7, 2009 Hmmm, I hear a slight high pitch buzzing noise from the fuel pump, I guess you could call it a hiss. Maybe you could turn the key to the on position and quickly run to the back to see if you hear it. There should be a noise from the pump for a few seconds. If that's what you're hearing, then mystery solved. If you do hear the pump, but not the hissing, then maybe a slight exhaust leak? Link to comment Share on other sites More sharing options...
headpeace Posted April 7, 2009 Share Posted April 7, 2009 haha, mine does that too, I never really worried about it cuz it still runs fine, but I always have wondered "What the hell is that"? Link to comment Share on other sites More sharing options...
Nytrosfinder Posted April 7, 2009 Share Posted April 7, 2009 If its a whine then its the upper bearing on the pump, if its a hiss then maybe their maybe a clog by the intake hose... that was how mine was then i took my pump out and their was a pebble by the intake hose... don't know how it got there... but it was there... Link to comment Share on other sites More sharing options...
94extreme Posted April 7, 2009 Share Posted April 7, 2009 yes, pump buzzes. sometimes you can hear it sometimes not. If you do hear the pump, but not the hissing, then maybe a slight exhaust leak? highly possible.. there is a tail pipe hanger real close to the fuel tank. sometimes those will rust out and hiss through a hole right there where the hanger is welded to the pipe. Link to comment Share on other sites More sharing options...
Kingman Posted April 7, 2009 Share Posted April 7, 2009 yes, pump buzzes. sometimes you can hear it sometimes not.highly possible.. there is a tail pipe hanger real close to the fuel tank. sometimes those will rust out and hiss through a hole right there where the hanger is welded to the pipe. That's exactly what I was thinking of. Link to comment Share on other sites More sharing options...
94extreme Posted April 7, 2009 Share Posted April 7, 2009 i take you had one of those too? Link to comment Share on other sites More sharing options...
Kingman Posted April 7, 2009 Share Posted April 7, 2009 (edited) Yeeeeep. Edited April 7, 2009 by Kingman Link to comment Share on other sites More sharing options...
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