MiCarl Posted April 11, 2013 #26 Posted April 11, 2013 When gasoline is in a tank in the ground its temperature is generally cool. When you pump it into the motorcycle on a hot day the gasoline will warm up and expand. I believe that sleeve in the fill neck is to ensure an air pocket so the gasoline has room to expand without running out the vent. Is an extra pint of fuel worth messing with it?
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