Quote:
Originally Posted by proexpert  Ron,
What is the carbon canister for?
Pro |
gas vapors from the tank (and elsewhere if applicable) are collected in the canister and condensed back to liquid form so they can be returned to the system, usually burned at start-up. it's a way of reducing hydrocarbon emissions to the atmosphere. in the bad old days the fuel system was simply vented to the outside air to allow expansion due to evaporation.
here's another difference with the hfv6, the fuel system providing pressure to the engine does not return excess gas to the tank like previous ones did. this keeps warmed fuel from flowing back into the tank which would generate more vapor so this change helps reduce emissions as well.
rg