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Join Date: Nov 2007
Location: Chandler, Arizona
First of all find out if you are getting fuel flow from the petcock when you apply vacuum to it. If you are, it is not the tank/petcock. If you did not drain the carbs while the bike sat, you probably have a really nasty rusty corroded mess inside. I kept my carbs filled with Seafoam while I had the engine out for the better part of a year. You can remove the jet chamber covers with the carbs still on the bike. Get a mirror and look up in there and see what it like. Since that is the lowest point where there is fuel, it is the last place the fuel will evaporate from, and will likely have the worst damage. I would also remove the coasting enrichener diaphragms and see if they are damaged. Mine melted from ethanol.
The CA tank is the one to have, since it gives you a positive vent if the normal vent that goes through the fuel cap becomes plugged up.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike