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gas smell in rear

Forum: C3 HVAC, Fuel, Emissions, and Exhaust

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gas smell in rear

Posted: 6/17/06 11:05amMessage 1 of 8
B
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Joined: 8/16/2004
Posts: 17
Recently a mell of gas has begun to fill the cabin, it is very pronounced when the tank is full, and it will stabilize when I am going straight.  When I make turns or hit a bump the smell gets worse.  Does the fuel tank vent throught he cabin or smoething like that? I have a 1973 350/270 coupe.
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gas smell in rear

Posted: 6/17/06 11:38amMessage 2 of 8
T
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East Hanover, NJ - USA
Joined: 9/25/2004
Posts: 525
Vette(s): '68 Black Conv. Matching 327/300 4 Spd. P/S, P/B, P/W, Tele, A/C

Common problem.......Usual culprit is a bad gas cap.  it worked for me.

http://www.VetteRegistry.net/forum/forum_posts.asp?TID=25443&KW=g as+smell

Good luck,

Anthony

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gas smell in rear

Posted: 6/17/06 12:25pmMessage 3 of 8
w
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VENTRESS, LA - USA
Joined: 10/8/2003
Posts: 87
Vette(s): 1971 Blue Roadster, sb400, cam, electronic ignition,10 disc CD changer, 2.5" chambered exhaust, 3.36 rear,tremec 5 speed from Classic Chevy, fiberglass rear spring and vintage air.
My 71 was doing this. It was the gasket between the filler neck and the tank had deteriorated to almost nothing.
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gas smell in rear

Posted: 6/17/06 5:16pmMessage 4 of 8
R
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Montesano, WA - USA
Joined: 9/27/2003
Posts: 1931
Vette(s): had a really nice one. sold it to a good friend. Purchased 2004 custom coupe in Feb. 2009 did not tell anyone here until August 2009. BAD I KNOW.
YAH, YOU REALLY HAVE TO CAREFULL ABOUT THAT GAS SMELL THAT IS COMING FROM YOUR REAR, ALMOST TOXIC, SO I'VE HEARD.  JUST COULDN'T RESIST.
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gas smell in rear

Posted: 6/17/06 5:27pmMessage 5 of 8
w
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Roseland, NJ - USA
Joined: 12/4/2003
Posts: 966
Vette(s): 1974, 454 with 4 on the floor, matching numbers.
I have a 74 and my problem was with the over flow hose. It was cracked about 1 inch from the filler neck. The smell was very strong when the tank was full, after the level went down a bit the smell was gone.  
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gas smell in rear

Posted: 6/17/06 7:13pmMessage 6 of 8
g
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Irving, TX - USA
Joined: 8/21/2004
Posts: 4286
Vette(s): #1 -1969 Corvette Coupe Riverside Gold, black interior,MN,A/C,350/350,PS,PB,window cranks. #2 -2000 C5, black/black, 6 sp, Bose system & lots of buttons.

I had the over flow hose problem too, fixed now.

That was bad, Larry......gas smell from the rear!  Don't put any broccoli in your tank..... 

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gas smell in rear

Posted: 6/17/06 8:16pmMessage 7 of 8
K
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Piscataway, NJ - USA
Joined: 10/16/2002
Posts: 106
Vette(s): 1973 coupe silver Eng.383 stroker. Tremec 5spd 1977 L48 Stock
 All of the above plus check your drains by the back window one on each side. The rubber hose is inside the rear compartment. If they are dried out or cracked they will allow fumes to enter the cabin. They will also let water in also but I doubt our sharks are out in the rain. 
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gas smell in rear

Posted: 6/18/06 3:45pmMessage 8 of 8
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22716
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
[QUOTE=Buster] Recently a smell of gas has begun to fill the cabin, it is very pronounced when the tank is full, and it will stabilize when I am going straight.  When I make turns or hit a bump the smell gets worse.  Does the fuel tank vent throught he cabin or smoething like that? I have a 1973 350/270 coupe.[/QUOTE]

All of the above could be a source.
Since it is more strong when full, and turning corners, I would check the vapor return/separator, on the upper driver's side of the tank. It is plastic, and they do crack over time. The hoses for the vapor return, and the fuel pump return on the pass. side can also be cracked/damaged, allowing a fuel smell when turning, or when full.
After the fuel level lowers somewhat, the raw fuel in the tank will not be high enough to sneak out of these places. It is possible there is a hole/crack in the tank somehwere around the top.
Bottom line is, it will most likely be a fuel hose on the tank.

Joel Adams
C3VR Lifetime Member #56    

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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

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