Fuel tank venting - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Solver · 08-09-2006, 08:09 PM

No not venting about an install
Question about tank venting
I have 72 tank in and ready to hook up lines but really not sure what to do with the return line to the charcoal canister in pass front fender as I wasn't planning on replacing it. What should I do about the venting? Don't want to just leave the return line open behind seat as that would put vapors in truck. Can't really seal off vent tube coming out of tank as 71-72 gas cap is non vented and the 69 style doesn't seem to fit the neck of my 72 tank anyway.. . What have you guys done in this situation as I am sure no one really reinstalls that canister do they?

Fred T · 08-09-2006, 08:24 PM

Tanks on both my 52 and 69 are not vented. The replacement caps only allow air to get sucked in, they don't vent out. It also keeps fuel from running down the side of the truck. I would cap the vent and not worry about it.

08-09-2006, 08:09 PM	#1
Solver Registered User Join Date: May 2000 Location: Storm Lake, Ia Posts: 1,449	Fuel tank venting No not venting about an install Question about tank venting I have 72 tank in and ready to hook up lines but really not sure what to do with the return line to the charcoal canister in pass front fender as I wasn't planning on replacing it. What should I do about the venting? Don't want to just leave the return line open behind seat as that would put vapors in truck. Can't really seal off vent tube coming out of tank as 71-72 gas cap is non vented and the 69 style doesn't seem to fit the neck of my 72 tank anyway.. . What have you guys done in this situation as I am sure no one really reinstalls that canister do they? Attached Images __________________ 1972 Cheyenne Super 20 LWB-Blue 1972 Cheyenne Super 10 LWB-Black 1972 Cheyenne Super 10 LWB-Red 1972 Cheyenne Super 10 LWB-green 1972 GMC 4x4 LWB-White 1971 Cheyenne 10 LWB-Ochre 1971 Cheyenne 20 Longhorn-Copper 1971 Cheyenne 20 Longhorn-Black 1969 Custom 10 LWB-lt blue 1968 GMC 3/4 ton-green 1968 1/2 ton swb stepside-silver 1967 Chevrolet CST 10 LWB-green 1967 Chevrolet custom 20 LWB-Maroon

08-09-2006, 08:24 PM	#2
Fred T Cantankerous Geezer Join Date: Aug 2002 Location: Bel Aire, KS Posts: 6,264	Re: Fuel tank venting Tanks on both my 52 and 69 are not vented. The replacement caps only allow air to get sucked in, they don't vent out. It also keeps fuel from running down the side of the truck. I would cap the vent and not worry about it. __________________ Fred There is no such thing as too much cam...just not enough engine.



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