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gas exaust smell |
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PHAT69AMX
AMC Addicted Joined: Jul/07/2007 Location: West Virginia Status: Offline Points: 5905 |
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I'll contradict myself, Jetting could cause the smell, unburned gas in exhaust pipes..
Revised previous post...
Exhaust pipes and gas tank, proximity can "boil the tank", another "new fuel" possibility... Once when "in-between" getting an exhaust finished, drove mine awhile with half-pipes, no tailpipes, exhaust ended at rear end, and yep, it would boil the gas tank, lol ! |
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mixed up
AMC Addicted Joined: Jun/16/2015 Location: Monroe mich Status: Offline Points: 2161 |
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you say the carb drains down while setting after a long drive park the car t hen look in the carb see if its dripping into the intake could have 1 a sunken float or 2 high float level causing the carb to siphon the fuel out of the bowls or bad needles & seats
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69 amx 290 auto
65 220 290 4spd 80 ford fairmont |
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Red Devil
AMC Addicted Joined: Jul/10/2007 Location: Canada Status: Offline Points: 1743 |
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If your '68 has no charcoal canister to store fumes from the fuel tank and carburetor bowl vents, and both just vent to atmosphere, it will be pretty tough to control fuel smell from normal evaporation in an enclosed garage.
Suggest add a charcoal canister with appropriate connections to tank and carb like later models, if possible. Hope this helps, RD
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Ken_Parkman
AMC Addicted Joined: Jun/04/2009 Location: Ontario Status: Online Points: 1815 |
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Yep - old cars stink. We are spoiled by newer stuff.
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akimmet
AMC Nut Joined: Aug/02/2012 Location: Republic OH Status: Offline Points: 428 |
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A little bit of gas smell is normal, but a lot of gas smell indicates a leak, pressure build up, or running extremely rich.
You seem to have checked most of the obvious stuff already. Gas smell from the exhaust is almost always from the idle mix being set extremely rich. Try tuning your idle mix with a vacuum gauge, it is far more accurate than tuning by ear. It isn't uncommon for some carburetors to have ruined idle mix screws from people over-torquing them. Take one out and check for flat spots on the taper of the needle. Float mis-adjustment, can cause an extremely rich condition as well. The carburetor bowls being empty after sitting a week is somewhat normal for an aftermarket carburetor. Modern gas simply evaporates far more easily. |
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ditdit
Supporter of TheAMCForum Joined: Dec/30/2007 Location: South Carolina Status: Offline Points: 111 |
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thank you all for the sugestions
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1968 AMX 401/727
1984 Eagle 4.0 org owner 1988 Eagle (time machine) 1980 Jeep J10 (under restoration) Carolina AMC (Senior Member) |
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RUMBLR
AMC Apprentice Joined: Mar/03/2010 Location: South Australia Status: Offline Points: 118 |
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Id say more to do with fuel tank venting than a carb issue.
Old rubber fuel lines could also be an issue. PTFE fuel lines may assist, and a filter of some sort or carbon canister on the vent line. |
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343 904 M20 - 11.83@115
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purple72Gremlin
AMC Addicted Charter Member Joined: Jul/01/2007 Location: Illinois Status: Offline Points: 16591 |
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