Strong gas fumes when tank is full

2jeeps4me · Aug 2, 2018

My ‘16 JKU stinks up my garage with strong gas fumes when my tank is filled. No puddles of gas on the floor or sign of leaks. Any idea what would cause this ? The fumes subside after the tank is three quarters full or less. Thanks !

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WJCO · Aug 2, 2018

Light a match and the leak will be quite obvious.

(Just kidding to be politically correct in today's internet world so I don't get sued. )

Check your charcoal canister and purge valve.

JohnnyD8586 · Aug 2, 2018

2jeeps4me said:
My ‘16 JKU stinks up my garage with strong gas fumes when my tank is filled. No puddles of gas on the floor or sign of leaks. Any idea what would cause this ? The fumes subside after the tank is three quarters full or less. Thanks !

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When you fill up, do you let it stop on its own and call it good, or do you day F it and top it off to max? i have buddies whoe shake their trucks trying to get all the air bubbles out when filling up haha not my idea

Eloucha · Aug 2, 2018

2jeeps4me said:
My ‘16 JKU stinks up my garage with strong gas fumes when my tank is filled. No puddles of gas on the floor or sign of leaks. Any idea what would cause this ? The fumes subside after the tank is three quarters full or less. Thanks !

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Same here if u figure it out. Plz let me know. Only when I fill it up.

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Gobicon2017 · Aug 2, 2018

I believe there is a thread on this somewhere. I remember some we’re having issues with the filler hose. Hope that helps.

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2jeeps4me · Aug 7, 2018

Thanks, I ‘ll look it up !

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Ctmartin2000 · Sep 6, 2018

Fuel smell when tank is full

Had the same problem on a 2007 jk Sahara we purchased recently, after ruling out all evap lines for leaks with a smoke machine, I dropped the fuel tank and found that the smell was coming from cracks in the fuel pump mounting flange. Replaced with new fuel pump assembly and problem solved.

zimm · Sep 6, 2018

Still under warranty? I'd have the dealer find it. They have the magic smoke machine for the evap system. I wouldn't mess around with fuel fumes.

GeoWillys · Mar 10, 2019

I have a 15 jk Willys and had that problem. Since I have an extended warranty I took it to the dealership and they found there was an issue where the filler neck connects to tank. Don't remember what was exactly wrong but they ordered a part and installed it. No more gas fumes.

Brute · Mar 10, 2019

I had a leak at where the wire for the sending unit enters the tank...also check the evap lines

Ajkaz · Mar 10, 2019

My 07 had this issue, I replaced the keyed gas cap (which passed smog no problem) with an OEM non locking gas cap and it went away....

Lojo · Mar 11, 2019

GeoWillys said:
I have a 15 jk Willys and had that problem. Since I have an extended warranty I took it to the dealership and they found there was an issue where the filler neck connects to tank. Don't remember what was exactly wrong but they ordered a part and installed it. No more gas fumes.

Rubber grommet connects the two. They get cracked from heat and cold over time. Can cause fumes or even a fuel leak. I ran into a similar issue on another vehicle.

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Strong gas fumes when tank is full

2jeeps4me

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