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You stated...There is strong continuous vacuum going to the canister w the engine idling. IIRC should only have higher vacuum with higher RPM's. At least that is how my 74 is working. Don't think high vacuum at idle is normal. I could be wrong.
I have not tested the vent valves on the canister as I have purchased new ones. However, I can go and hook up the mightyvac to the old canister and check to see if theyll hold vacuum. My understanding is that once saturated with gas, the charcoal is ruined and the canisters must be replaced, so I didn't do any testing on the old unit.The truck has dual tanks. I only use the driver side bc I am unsure of the condition of the passenger and do not want to risk sucking gunk into the fuel system until I drop that tank to clean it. I have never attempted to swap over to the passenger tank.I wonder if the accumulation has been happening over time - yesterday I did notice evidence of gas leaking out the canister before I saw it actually happening as I limped home. The raw fuel leaking out the canister did not smell fresh, as I mentioned before, but more similarly to locktite? Perhaps simply running through the charcoal made it smell that way.