DUAL FUEL FILTER FUNNEL from Aircraft Spruce DUAL FUEL FILTER FUNNEL The specially designed filter removes water and dirt from gas, even 2-stroke mixtures. Ethanol attracts water more than regular gasoline. Never before has a fuel filter Brand: SprucePrice: $52 Fuel Filter Funnels - McFarlane Aviation Fuel Filter Funnels. Funnel that stops water and dirt! Mr. Funnel is a heavy-duty, fast-flow filter in a funnel that separates damaging free water and solids from fuel. Works with all aviation fuels, gasoline, diesel and kerosene.