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2002 Mako 314 Fuel Tanks

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  • 2002 Mako 314 Fuel Tanks

    Labor Day Weekend'19 I started the fuel tank removal from my Mako 314. One or both of the 150 gallon tanks were leaking gas into the bilge. I plan to outline the tank removal process I went through and the custom design and installation of replacement of the tanks.


    BackInBlack[br]Charlestown RI

  • #2
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Name:	1 Leaning Post Port Side.jpg
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Name:	3 Leaing Post Removed.jpg
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Name:	2 Leaning Post Port Side.jpg
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ID:	540612 Port Tank removal was a B****! In total it took 5 days...
    BackInBlack[br]Charlestown RI

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    • #3
      Click image for larger version

Name:	4 Port Deck Cut & Removal.jpg
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Name:	6 Port Tank Filler & Vent.jpg
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Name:	5 Port 150 gal tank exposed.jpg
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      BackInBlack[br]Charlestown RI

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      • #4
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Name:	9 Removal Attempt #2.jpg
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Name:	7 Port Tank Sending Unit and Supply.jpg
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ID:	540621
        Attached Files
        BackInBlack[br]Charlestown RI

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        • #5
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Name:	10 Removal Attempt #2.jpg
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Name:	11 B-2000 Resin Cleaner.jpg
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Name:	12 20 Ton House Jack.jpg
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          BackInBlack[br]Charlestown RI

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          • #6
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Name:	14 Holes Drilled.jpg
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ID:	540628
            BackInBlack[br]Charlestown RI

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            • #7
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Name:	16 Tank Cut.jpg
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Name:	17 Tank Top Removed.jpg
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Name:	18 Baffles Cut & Removed.jpg
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              BackInBlack[br]Charlestown RI

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              • #8
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Name:	19 Front Tank Lift.jpg
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                BackInBlack[br]Charlestown RI

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                • #9
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Name:	22 Tank Removed.jpg
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Name:	23 Tank Coffin.jpg
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Name:	24 Tank Coffin Cleaned Up.jpg
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                  BackInBlack[br]Charlestown RI

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                  • #10
                    The reality is that FOAMED in tanks do not want to come out easily. They also trap moisture between the aluminum tanks causing crevice corrosion and fuel leakage. The secret to the removal is FGCI's B2000 Resin Cleaner Here is the link: https://www.fgci.com/item/139080/B-2...leaner-1Gl-Cn/ It will dissolve the foam and break the barrier around the tank on the bottom and at the stringers. The instructions do not recommend how much to use or how long to wait. At first I ordered one gallon at a time and then a 5 gallon container for the Starboard tank. It was a wait and see procedure that took 5 days on the Port tank. I slowly poured the B2000 around the perimeter of the tank and dug out as much dissolved foam as I could. Quite the mess. In retrospect, I would have dumped several gallons around the tank, waited 24 hours and then removed the tank. This is what ti did on the Starboard tank. Two days vs. Five days removal time! In both cases the tanks were drained and then filled with fresh water and a small bottle of Dawn soup. I felt safer drilling holes and cutting apart the tanks this way. Hydraulic jacks were required to break free the tanks and lift the tank parts free from the hull.

                    Custom tanks have been designed and will installed in spring'20.
                    BackInBlack[br]Charlestown RI

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                    • #11
                      I have a 313 (Express version of your rig). I hope to never have to tackle this task on mine, but appreciate your documentation of your adventures.

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                      • #12
                        Tank update. Two custom tank designs have been submitted and drawings approved. New tanks were based off original 150 gallons (each) design but downsized in order to ease installation. The gunnels would have to be removed to install original size tanks. New tanks are 115 gallons (each) based on my spec's to a marine fabricator Luther's Welding in Bristol RI. Attached are several pic's of the Port fuel tank and the drawing of the new design. I hope to have them installed before the summer. Once decks are installed I plan to install custom SeaDek embossed decking, coaming polsters and helm pad.

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Name:	Mako 314 New Tank Design.png
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                        BackInBlack[br]Charlestown RI

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