Question about Yamaha V Star Classic Motorcycles

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My gas tank collapses in the center when riding. It will even collapse if it's even touched just slightly. I did notice that my fuel level is low when it does it. why is it collapsing? This is a V Star 1300, 2007 model, XVS1300CT.

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Most likely your fuel tank vent is as you consume fuel a vacuum is developing in the tank....the lower the tank level gets the worse the vacuum.
If you tried opening the gas cap you likely would hear a whoosh of air rush into to the tank.
If you inspect the filler neck you should see a hole on the inside of the neck that is attached to a hose.....ensure the hole is clear and trace the hose checking for any pinches in it....further down you will find a "rollover valve" on the vent hose.....its designed to allow normal venting, but if the bike tips over, its designed to seal off the vent to prevent gasoline spillage, fire etc. Sometimes the rollover valve sticks and needs to be tapped and flushed and blown through to verifiy its clear.....make sure if you remove it you install it the same way....its designed to mount one way
If you continue riding the bike open the cap often as the vacuum can collapse the tank permanently, and tanks aren't cheap!

Posted on Mar 25, 2011


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