Try leaving the lids on the fuel tanks propped open slightly. This is permeation on the duel system that bleeds out through the plastic fuel tank walls. We dont see in on all though occasionally have one. The best is to not top them off and we find the fuel vapors are not as bad. Though still can leak up through the vents on the fills. The topping off tanks are usually the ones we see it on most frequently. There are some with tank permeation, we also think they leak through the hose connections slightly. Also check the fuel tanks on top for worn gaskets from Ethanol. We will get more ideas tomorrow.BCBLast edited by Bass Cat Boats on March 12th, 2012, 11:20 pm, edited 1 time in total.