The cap vent has been in the open position. Yesterday I disconnected the vent line at the top of the gas tank (it connects to the air cleaner elbow). Today after a couple of pumps with the primer it started right up. Ran it out on the streets. No problem with restart. Tomorrow will be the test! Than...

At the engine compartment or on the tank top?

I've been having trouble getting fuel to the carb. Here's the typical sequence. I go out to try and get the M/37 started. Doesn't fire. I then brake the fuel line at the carb and try to bring up fuel using the primer lever. Nothing but a sucking sound. I then removed the fuel tank cap and went back ...