Re: Charcoal Canister???
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The canister contains activated charcoal which will absorb evaporated gas vapors from the gas tank and the carburetor float bowl when the engine is not running. When the engine is running, fresh air is drawn back thru the canister and into the carburetor, pulling the gas vapor back out of the charcoal so it is burned as fuel. The whole setup is called the evaporative emissions system and is a good thing for the air we breath. As a sidelight, there is a solenoid valve on the carburetor that is energized when the engine is running, so the float chamber is vented directly into the carburetor, bypassing the canister.
You can check for plugged conditions in the canister by blowing (DO NOT SUCK) into certain ports of the canister and checking for air coming out of other ports. See diagram above....
1. While blowing into A and holding C and D closed, air should come out of B.
2. While blowing into B, no air should come out of A C or D.
3. While blowing into C, air should come out of A B and D.
The gas tank gets it's replacement air from the canister as fuel is being used from it while the engine is running (assuming the gas cap is on tight). On another car, I once had a crimped line from the gas tank to the canister and gas vapor would build pressure in my gas tank.
The service manual also says to disconnect your battery when doing the above procedure.
There you go, good luck.
'88.5 hrdtop, 29's on 15x8's, want small lift + big exhaust.