[Formulajones]

Originally Posted by tjs72lemans

Thanks for all the info and insight. PontiacJim, thanks for the diagram. I looked in my manual and have that. So, the A body stand pipe allows for the tank to vent. My issue is, I did not have and was not planning on using the purge valve that would've been in my intake. I installed an after market thermostat for a gauge there. If I were to run the canister to the carb port, it would be sucking vapors at all times and possibly messing with my idle. If this line to carb was left open to the atmosphere and hanging down by frame, it could still vent fumes I assume, but maybe smell a little at times when parked. Am I wrong or is there a better way around this without the purge valve in intake?

On my chevelle, I have no purge valve on the intake at all.

Only hoses to the engine........I simply run the 3/8 hose through the PCV as pictured which goes over to the base of the carb.
Then the little vacuum line runs along with it, also to the carb, and is ported vacuum at the metering block (holley carb) to trigger the vacuum switch on top of the charcoal canister. That's it.

It absolutely has no affect what so ever on idle or part throttle cruise. My air fuel ratios are very steady and spot on.