Yamaha - Fuel tank - 6BX-F4111-10-00Yamaha Fuel Tank Fuel Storage Component 6BX F4111 10 00 Overview A lot of fuel problems dont start at the enginethey start here. The tank is where everything begins, and if its not clean, sealed, and venting properly, youll chase issues all the way down the line. Ive seen engines stumble, lose power, or run rough just from contamination or poor fuel flow out of the tank. Keeping a solid tank in place keeps the whole system working the way it should.