Gas smell in cabin

Mauro Owner Massachusetts Posted   Latest   Edited  
Updated
Other
2015 Chevrolet Suburban LTZ 5.3L (C L83) 6-spd (6L80)
Fuel Odor

Getting a fuel odor in cabin of Suburban, at times worst than others, see no visible fuel leaks at tank or under hood as well as no fuel smell. Just wondering if anyone else has encountered this issue.

Thank you in advance for any info.

0
Gerald Owner/Technician
Newfoundland and Labrador
Gerald Default
 

We see a lot of these trucks and burbans with rusted out fuel sending units sometimes with no visible fuel leak until the tank is dropped.

0
Default Ð Awarded
Craig Technician
Illinois
Craig Default
 

There is a bulletin. 14858. Possible leaking high pressure fuel pump under intake manifold.

+1
Default Ð Awarded
Mauro Owner
Massachusetts
Mauro Default
 

Thanks for the reply Craig, I'll take a look in the am, but when I pop hood there is literally no smell of fuel.

0
Default Ð Awarded
Jim Technician
Michigan
Jim Default
 

Seen it alot on Hondas. Lose spark plugs.

+1
Default Ð Awarded
Paul Mechanic
Illinois
Paul Default
 

I have read that before-loose plugs, as a possible source of unexplained fuel odor, but if the plug was that loose to allow hydracarbons to escape on the compression stroke, wouldn't a misfire have been detected?

0
Default Ð Awarded
Daniel Owner/Technician
Texas
Daniel Default
 

...I agree with Jim...check for loose spark plug(s)...Dan H. ...South Texas...

0
Default Ð Awarded
Richard Technician
New York
Richard Default
 

I have seen the leaking high pressure fuel pumps cause this smell as Gerald mentioned. I think they do not leak all the time, kind of like water pump seals. Try running it and shutting it off a few times. The few I have seen also had high fuel trims. The fuel leaks into the engine and raises the trims.

0
Default Ð Awarded
Randy Diagnostician
California
Randy Default
 

Run hvac on recirculate and see if smell goes away

0
Default Ð Awarded
Caleb Diagnostician
Indiana
Caleb Default
 

Need to check fuel sending unit in tank for being rotted out on top. Also check the high pressure pump an direct injector seals for leaks under the intake.

0
Default Ð Awarded
Zach Technician
Minnesota
Zach Default
 

We also have had a couple of Silverado's with leaking high pressure pumps and sensors. Customer complaint of gas smell in the cabin, not very noticeable in the engine bay until we got things nice and hot. There is some foam under the intake that holds the vapors and fluid in.

0
Default Ð Awarded
Mauro Owner
Massachusetts
Mauro Update
 

Just wanted to post the fix, Thanks to all who responded, the give and take on this forum has been impressive....someone had installed NGK plugs and also left 3 of the 8 hand tight, so which one was it? idk but thanks to the info from you guys it sent me in the right direction.

0
Update Ð Awarded
Daniel Owner/Technician
Texas
Daniel Default
 

...Glad ya got it whipped into shape...I would recommend the proper plugs (as those are "probably" not them)...Dan H. ...South Texas...

0
Default Ð Awarded
Mauro Owner
Massachusetts
Mauro Default
 

You got that right Daniel! I should've mentioned that I did replace the NGKs with AC Delcos, all is good now.

0
Default Ð Awarded
Daniel Owner/Technician
Texas
Daniel Default
 

...Iridiums right?...Dan H. ...South Texas...

0
Default Ð Awarded
Mauro Owner
Massachusetts
Mauro Default
 

👍👍👍

0
Default Ð Awarded