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Join Date: Nov 2007
Location: Chandler, Arizona
If you hear a "hissing" sound coming from the gas cap, you definitely have a venting problem. There should never be any pressure or vacuum in a fuel tank. If it is a CA model you have a nice option for fixing venting problems, if it isn't, try removing the valve from inside the gas cap, and the rubber grommet at the back of the fuel filler.
The Vulcan is prone to starting up and running on one cylinder for over 30 seconds after sitting for a few days, I think it is a fuel supply problem caused by the vacuum petcock. Both my Vulcan 750s have done it. But not while running out on the road. I did have a problem once where the rear float was rubbing against the float bowl, and would stick, sometimes in the up position, sometimes in the down position, resulting in both flooding and fuel starvation at the rear cylinder.
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