yeah i don't know about this one. maybe its one of those lines that 73shark suggested. i can look but i don't know how to test.
anyways, the seats. a guy at work can fix and weld the nut. probably beef up all of them.
my plans are new interior from willcox before the end of the year. probably do the seats first. and then got some motor issues. carb rebuild and engine pressure test will determine if it needs a valve job or rings. the dude is thinking its valves. what else? if i recover from this past weekend, maybe a quartz clock and new radio and new antenna.
never ends.

 

Determine which hose is the vacuum supply and pull a vacuum on it with a Mityvac or similar vacuum pump and run the selector thru its settings and see if your air flow changes. Or you can check with a vacuum gauge to see if you have vacuum at the supply line with the engine running. First I'd just make sure none of the lines are loose.