charcoal canister

D

danny

New member
i did a search and didn't find the answer i was looking for so maybe you guys can help. can someone explain how the charcoal canister is supposed to work? i see three ports on the top, one goes to the tb, one goes to the fuel tank and the other has nothing. when my truck is running and i put my finger on the empty port it draws in vaccum. is this supposed to do this? i would imagine with the truck running that port should have a valve or something so there isn't a vac leak(right) i don't want to eliminate my charcoal canister b\c the truck is in the garage and i don't want to have fuel smell throughout the house. also i seem to have a hissing (or suction) noise coming from near the fuel tank when running, anyone come across this or have ideas. i replaced fuel cap and hoses look ok. sorry for the long post, thanks for any help you can give, danny
 
Loeryder

Loeryder

New member
Re: charcoal canister

I'd say thats normal behavior.

vac_routing.sized.gif


Make sure the line going to the TB isn't all cracked from the heat.
 
Daryl H

Daryl H

Donating Member
Re: charcoal canister

The whole point with the canister is for emissions.
When the fumes/air in the gas tank expands it sends the gas fumes to the canister to filter out the gasoline. With the vehicle running the engine then sucks atmospheric air through the canister to clean the carbon of gas. All of this helps make the world a better place to live in blah, blah, blah and more importantly keeps the smell of high octane from fumigating your garage.
 
D

danny

New member
Re: charcoal canister

yes i'll be at the meet on sat. i figured there should be some kind of valve that lets vac pull fumes when the engine is running then with it off the fumes either collected in the canister or vented out. otherwise you will always have a vac leak
 
blk00z28

blk00z28

Forced to by choice
Re: charcoal canister

danny said:
also i seem to have a hissing (or suction) noise coming from near the fuel tank when running, anyone come across this or have ideas. i replaced fuel cap and hoses look ok. sorry for the long post, thanks for any help you can give, danny
Click to expand...

Sure thats not just your fule pump making that noise? I can hear mine all the time outside of the truck. :dunno:
 
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