Hello, I'm trying to get my 1990Tw to start up after I restored it a little, I replaced the petcock and fuel line, and also the two air vent hoses in the back. Do the air vent hoses connect to anything but the carb? Also I'm having a fuel vacuum problem where I cannot get fuel to the carb. The fuel is on and the lines work when disconnected from the carb but as soon as I connect them and turn my fuel back on nothing happens. Even when I try to start the bike no fuel flows into the carb, Whats causing this? My canister or the lines that feed from my fuel tank to the canister and carb? it's the original but the bike has been sitting for several years.