I have a good one...'06 Skeeter Walleye style w/75 Yammy tiller that has a 20 gallon gas tank. I haven't put any gas in tank after 4 trips and am registering 1/4 tank on gauge(definitely right!) My gas is overflowing from the fill tube opening. What could cause this? Back pressure? Is there a baffle between the tank and the fill tube hose? Lost about 1 Cup or so of fuel. Any vent that could be clogged?