Raw gas smell in cabin

Citrusbb · 07-28-2023, 05:31 PM

I have a 2020 2SS 1LE 6M with 29,000 miles. Driving in town, traffic lights, moderate traffic. Started smelling raw gas as I was stopped for a light. Drove about 4 miles home, still smelled gas. I looked all over & under, did not see any sign of wetness or drips.Still a strong gas smell, like I was inhaling from a 5 gallon bucket. I let it sit for an hour, cranked it up, looked everywhere again, no sign of leak. I then drove it about 5 miles on a back road, and did not smell it anymore. Any similar experiences?

302crossram · 07-28-2023, 07:18 PM

filler neck leak ??????

JimRockford · 07-30-2023, 01:39 PM

if its a one time thing, it can be explained by some POS ahead in traffic spilling gas on road and it gets on your car until it evaporates.

if problem recurs:

if any gas smell outside gas cap, swap gas cap, dealer parts dept may give you one for free/warranty without inspection.

if swapping gas cap doesn't fix it, or if no smell outside gas cap area, leave car at dealer service dept or any ASE shop authorized for warranty/emissions service. it is not safe to drive with an undiagnosed fuel leak.

btw, did someone "top off" the gas? ("topping off" is likely to fill/destroy the charcoal canister and cause massive gasoline smell.)

CalgaryZL1 · 07-30-2023, 01:48 PM

Quote:

Originally Posted by JimRockford

if its a one time thing, it can be explained by some POS ahead in traffic spilling gas on road and it gets on your car until it evaporates.

if problem recurs:

if any gas smell outside gas cap, swap gas cap, dealer parts dept may give you one for free/warranty without inspection.

if swapping gas cap doesn't fix it, or if no smell outside gas cap area, leave car at dealer service dept or any ASE shop authorized for warranty/emissions service. it is not safe to drive with an undiagnosed fuel leak.

btw, did someone "top off" the gas? ("topping off" is likely to fill/destroy the charcoal canister and cause massive gasoline smell.)

Does 2020 SS have a gas cap? My ZL1 doesn’t

arpad_m · 07-30-2023, 02:08 PM

The 6th gen has had a capless fuel filler system since day 1 in 2015, so it can't be the cap, only the filler neck.

ctrlz · 07-31-2023, 07:32 AM

I agree that if you don't smell gas after awhile this is not likely to be an underhood fuel leak, as that fuel will be pressurized and keep leaking.
Spillage in the fill area sounds most likely if smell went away.

I think topping off would be very unlikely to saturate the charcoal canister. I had posted the plumbing details for this system in another gas tank thread. The canister is not vented to atmosphere when you fill the car, so it would be very hard for liquid fuel to get into the lines. The vent valve only opens in purge mode when the canister vapors are evacuated to the intake.

wakespeak · 03-13-2025, 04:53 PM

Did you get this resolved? Having same issue. Raw gas smell. Could be exaggerated by track use flinging the fuel around the tanks.

Z28GTOSSMike · 03-14-2025, 08:45 AM

I had a similar issue but mine ran poorly while I could smell gas. Turned out being a bad O2 sensor letting the engine dump raw fuel into the exhaust. Word of warning, I didn't fix it quick enough and it killed my catalytic converter.

07-28-2023, 05:31 PM	#1
Citrusbb Drives: 2020 Camaro 2SS1LE 6M Join Date: Oct 2021 Location: Moultrie Georgia Posts: 15 View My Garage	Raw gas smell in cabin I have a 2020 2SS 1LE 6M with 29,000 miles. Driving in town, traffic lights, moderate traffic. Started smelling raw gas as I was stopped for a light. Drove about 4 miles home, still smelled gas. I looked all over & under, did not see any sign of wetness or drips.Still a strong gas smell, like I was inhaling from a 5 gallon bucket. I let it sit for an hour, cranked it up, looked everywhere again, no sign of leak. I then drove it about 5 miles on a back road, and did not smell it anymore. Any similar experiences?

07-30-2023, 02:08 PM	#5
arpad_m Drives: 2018 Camaro 2SS A8 Join Date: Jul 2017 Location: East Tennessee Posts: 13,150 View My Garage	The 6th gen has had a capless fuel filler system since day 1 in 2015, so it can't be the cap, only the filler neck. __________________ 2018 Camaro 2SS — G7E MX0 NPP F55 IO6 735 rwhp \| 665 rwtq Magnuson TVS 2300 80mm pulley \| Kooks 1 7/8" LT headers \| JRE smooth idle terminator cam \| LT4 FS & injectors \| TSP forged pistons & rods JMS PowerMAX \| DSX flex fuel kit \| Roto-Fab CAI \| Soler 95mm LT5 TB \| 1LE wheels \| 1LE brakes \| BMR rear cradle lockout \| JRE custom tune 1100 - 1/30/18 \| 2000 - 1/31/18 3000 - 2/06/18 TPW 2/26/18 3400 - 2/19/18 \| 3800 - 2/26/18 4300 - 2/27/18 \| 4B00 - 3/01/18 4200 - 3/05/18 \| 4800 - 3/14/18 5000 - 3/16/18 \| 6000 - 3/19/18

03-13-2025, 04:53 PM	#7
wakespeak Drives: 2020 ZL1 1LE Join Date: Sep 2012 Location: Austin, Texas Posts: 1,383	Did you get this resolved? Having same issue. Raw gas smell. Could be exaggerated by track use flinging the fuel around the tanks. __________________ 2020 ZL1 1LE [Moroso SC Expansion Tank, otherwise stock]

07-28-2023, 07:18 PM	#2
302crossram Drives: 2023 Sharkskin 2SS Join Date: Oct 2022 Location: NWFL Posts: 760	filler neck leak ??????

07-30-2023, 01:39 PM	#3
JimRockford Drives: 1SS + SS-Sedan M6 + Terrain diesel Join Date: Mar 2019 Location: The Big Road Posts: 65	if its a one time thing, it can be explained by some POS ahead in traffic spilling gas on road and it gets on your car until it evaporates. if problem recurs: if any gas smell outside gas cap, swap gas cap, dealer parts dept may give you one for free/warranty without inspection. if swapping gas cap doesn't fix it, or if no smell outside gas cap area, leave car at dealer service dept or any ASE shop authorized for warranty/emissions service. it is not safe to drive with an undiagnosed fuel leak. btw, did someone "top off" the gas? ("topping off" is likely to fill/destroy the charcoal canister and cause massive gasoline smell.)

07-31-2023, 07:32 AM	#6
ctrlz Drives: 2017 2SS, 50th pkg, M6, MRC, NPP Join Date: Jan 2016 Location: Ocean City, NJ Posts: 3,558	I agree that if you don't smell gas after awhile this is not likely to be an underhood fuel leak, as that fuel will be pressurized and keep leaking. Spillage in the fill area sounds most likely if smell went away. I think topping off would be very unlikely to saturate the charcoal canister. I had posted the plumbing details for this system in another gas tank thread. The canister is not vented to atmosphere when you fill the car, so it would be very hard for liquid fuel to get into the lines. The vent valve only opens in purge mode when the canister vapors are evacuated to the intake.

03-14-2025, 08:45 AM	#8
Z28GTOSSMike Drives: 2019 Camaro 1SS Join Date: Apr 2019 Location: Palm Bay, Fl Posts: 185	I had a similar issue but mine ran poorly while I could smell gas. Turned out being a bad O2 sensor letting the engine dump raw fuel into the exhaust. Word of warning, I didn't fix it quick enough and it killed my catalytic converter.

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