Quote:
Originally Posted by Tom Vaught
Can you post up a schematic?
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Sorry Tom, I'm in the middle of a move and all my books are packed up. My '71-74 big cars and A-bodies have all had 2 ports only on the canister, with the '72 cars having a thermal valve on the intake to keep the fumes out of the carb before the car fully warms up. This plastic valve is usually broken after all these years... Even as late as '74 the B bodies with California emissions used the two port setup. The tank port went to a metal vent line that went back to the gas tank while the carb port went to a port on the carburetor:
The vacuum controlled switches and solenoids didn't appear until the later '70s on Pontiac engines from the cars I've had.
Quote:
Originally Posted by Formulajones
That is correct, to some degree.
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You are absolutely correct, I forgot about the 2nd gen F-bodies as I've never owned one that far back.
And absolutely correct, the tanks are reproduced and there's zero reason not to replace it if you suspect yours is bad.