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BT74 12-16-2003 06:01 AM

Charcoal Canister
 
My '86 chevy k15 4x4 plow truck developed a strong gasoline oder during the last storm. Gas was puddling on the intake manifold and the vent line going from canister to clean side of the aircleaner was disconnected(not the line from floatbowl vent to canister). I reconnected it and the smell went away,...but the truck intermitantly started to flood out. I found one of the two wires that go to the top of the carb (qjet) chewed thru by mice and repaired it, but it continues to occasionally load up and stall. The odd thig is that at one point when I had the hood up,the gasoline smell was of OLD(very old) gas.Could one of the small diaphrams that are on the top of the canister be malfunctioning and be allowing gas to belch into the aircleaner via the vent line? Any help would be appreciated.

M&M CUSTOM 12-16-2003 06:40 AM

The charcoal canister is meant for vapor containment only.
If you are getting puddling there is source of the gas getting there that needs to be found.
Have you checked the sides of the Qjet for leakage?
Does it leak intermittently or a little bit all the time?
Without the book here I don't know what the wires are for off the top of my head, but that should not cause fuel leakage.
The canisters occasionally need replacement, yours could be due.
Is there any way you could check for vacuum on each of the lines on the canister, a T-fitting mounted in line will help with this.
Other than that, you have me stumped also.

bigblockbill 12-16-2003 06:44 AM

the wires that the mice chewed thru are for the mixture control solenoid make sure that you hear it clicking with the key on
key on eng off it will click for about 20 sec.
the charcol canister system has main vaccum going to it not to the air cleaner
ck the canister purge valve make sure it is working properly
make sure all the vaccum line are hooked up
if the canister is bad it could cause raw gas to go into the engine
the canister absorbs fuel vapors and retains them until it is purged or cleared by air drawn through a filter located either at the bottom of the canister or in the air cleaner snorkel
the canister absorbs fuel vapores when the engine is off .when the engine is running vapors are drawn fromt the canister into the engine .
hope this helps.

BT74 12-16-2003 07:00 AM

I can't actually see where the gas is coming from. When I pull the aircleaner the top of the carb is wet. I realize that a bad needle&seat, or a sunk float could do this....but the discovery of the disconnected vent line coicided with the fuel smell,and the flooding commenced when I hooked it back up. I realize the cannister is for vapor, but I was wondering if the charcoal was saturated enough if it could condense and belch back.Also the "old" gas smell(like when you drain gas from a car that's been sitting for 5 years)had me thinking cannister. As to the wires to the top of the carb, I have heard of these refered to as "electronic Q-jets". I have no idea what that controls, but the unit is inside the carb, and the wires feed into the top rh front of the cover assy.

BigBlock Bill, thanks. This cannister has 2 small vacuum lines to small diaphram assys ,one 3/8 line to the float bowl, one 3/8 line to the aircleaner(that t's off to the purge valve of the A.I.R)and one line back to the tank.

BigBlock Bill, thanks. This cannister has 2 small vacuum lines to small diaphram assys ,one 3/8 line to the float bowl, one 3/8 line to the aircleaner(that t's off to the purge valve of the A.I.R)and one line back to the tank.


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