Quote Originally Posted by Ebbtide View Post
I think I have pretty much resolved the issue. Last time I was at the boat the heater acted up. Since I was in a slip I went out and blew into the fuel tank to clear the vent. Heater fired almost instantly on the next try. I have done this 2 or 3 times now with the exact same result. When I blow into the tank kerosene or a mix containing seawater and kerosene always comes out the vent. Now I just need to figure out why my vent is filling up.
If your vent had a J loop in it then I doubt that you are getting water in through your vent. More likely your fuel cap is not seating tightly enough. If you undo your fuel cap and there is moisture or water droplets in the collar then you are not getting a tight seal.