Does anyone else have the problem of not being able to fuel up at a normal rate of speed. Iam unable to squeeze the handle all the way when fueling up. I noticed some white substance around the small vent hole by my fuel fill. IF this is the problem, is there a safe chemical that i can use to get rid of it. It seems to get worse every year. I have a 25ft pilot house with a 225 ox66. If i squeeze the handle fully, the fuel will overflow.