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  1. #1
    Cadet
    Join Date
    Jul 2003
    Location
    Boston
    Posts
    10

    Default Water in gas tank

    I made a Big mistake this past year and didn't top off the gas tank (about 1/2 to 2/3 full)When I brought the boat to the marina this summer it ran find until this past weekend. I had to be towed in because of excess water in filter and constant stalling of engine. I've replaced water seperator and have added dry gas - still won't runfor more then a couple of minutes. Any HELP would be greatly appreciated Thanks, Bob

  2. #2
    Moderator OBJ's Avatar
    Join Date
    Dec 2002
    Location
    Rayland, Ohio
    Posts
    10,153

    Default Re: Water in gas tank

    Hi Bob...welcome to iboats forum.If you are certain about the water, you will need to drain the carbs to remove any water trapped in the bowls. There should be a drain plug on each (taking for granted you have more than two carb.) If there is a carb cover, you may have to remove this to get to the drain plugs. Also, if would be a good idea to flush your fuel lines to remove any water in them. Good Luck.PS....if ya' need to post again, please include make, hp and year of your engine. You can also edit this post to include the above. This would be the prefered way.
    When in doubt...use the manual

    Rayland, Ohio....Along the Muddy Banks of the Mighty Ohio River.

  3. #3
    Seaman
    Join Date
    Feb 2003
    Location
    Bellevue WA.
    Posts
    72

    Default Re: Water in gas tank

    Here's what I did when I had water in the tank on the boat I bought that had sat for several years. I took the access cover off the gas tank, siphonedoff as much water as I could from the bottom of the tank, using and old gas line with primer bulb.Installed a gas/water seperator. Then as Jim said, drained the carbs. After running a tank of gas, removed the filter..it was 7/8 full of water. Ran another tank, about 1/4 water in the filter. Ran another tank, filer clear, no water.Jerry

  4. #4
    Lieutenant Commander
    Join Date
    Dec 2002
    Location
    Close to the end of the world
    Posts
    1,670

    Default Re: Water in gas tank

    Moving to Boats.

  5. #5
    Cadet
    Join Date
    Sep 2011
    Location
    Monterey, CA
    Posts
    28

    Default Re: Water in gas tank

    I just bought a 1963 Glastron Gulfstream with a 1989 Mercruiser V6 4.3 I/O. It ran great in the driveway and me being the *GENIUS* that I am decided to buy it without doing a sea trial, especially since the guy advertised the boat as 'TURN KEY", and hey, he seemed like a really nice guy...BIG MISTAKE. At first I couldn't even get it to run more than over 5 mph in the water, then it wouldn't even start. I had the carburator rebuilt and replaced the coil which seemed to help it a bit to the point where around 1800-2500 rpm it starts cutting out, when I reach about 3000 it surges but still misses. I know that the original tanks were replaced with an aluminum tank but the filler cap had a bad gasket and water got into the system. Are the problems I am having symptomatic of water in the gas? I know it could be a lot of other things like the ignition, or coil etc. but I am trying to identify other possibilities as a process of elimination.
    Any help, suggestions would be greatly appreciated.
    Thanks,
    James



    Quote Originally Posted by soh_ii View Post
    I made a Big mistake this past year and didn't top off the gas tank (about 1/2 to 2/3 full)When I brought the boat to the marina this summer it ran find until this past weekend. I had to be towed in because of excess water in filter and constant stalling of engine. I've replaced water seperator and have added dry gas - still won't runfor more then a couple of minutes. Any HELP would be greatly appreciated Thanks, Bob

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