im in a similar situation. my '74 has the 3 lines on the tank connected to the vapor separator - with the output line connected to a check valve. I replaced the rusted hardline with fuel hose, and added an AC-Delco charcoal canister (since mine was missing). The canister has an air-inlet, and two nipples for TANK and PURGE. I connected the TANK inlet to the fuel line on the vapor separator, and the PURGE line I teed into the PCV hose. I have a replacement vented cap - but still have strong gas smell in the cab.
Ran the truck this morning (overnight ~70 degrees) with 1/4 tank - and smelled like I took a swim in a puddle of 93 octane when I got home...
I may need to check/replace all of the lines on the tank - but is there anything else I'm missing?
I've seen reference to adding a vapor purge valve like this but not sure how it's to be connected to vacuum.
Any recommendations would be appreciated.
Hi @100ownernow. I cannot really comment on your concern even though mine is a '74 model. It has different vent system meant for asian market. I suggest to just read back the comments in this thread and am sure you'll get a lot of helpful insights from the experts.