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Checking my fuel tanks

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  • Checking my fuel tanks

    I took the floor off the two tanks on my Mako. Looks like they have been replaced. One 100 gallon tank and a second 50 gallon tank. No smell of fuel and no pitting. The foam was not soaked, they were just dirty. Cant find the manufacture plate. Just curious what the opinions are for replacing or keeping. There are more pics on my project thread...


    Steven Kwajalein Atoll, RMI


  • #2
    If you think they have been replaced then I would just inspect all the lines and ground. While open, replace anything that is worn and give it a good cleaning. Your nose is usually the best indicator of a leak....usually. Have you noticed any fuel in the bilge ? Pressure tested?
    Boca Raton, FL[br]Current: 2002 253[br]Former: 1995 19[br]Former: 1979 19b

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    • #3
      Definitely pressure test. Check the fill tube as well.

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      • #4
        Wife and I are making a decision to replace the tanks...better to be safe since we are this far into the project.

        RDS or Sunshine?
        Steven Kwajalein Atoll, RMI

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        • #5
          Replace is best, especially since you don't know when these were put in, and since you've already got it all open. And while you're at it, definitely replace the entire fill line, vent line, and line to motor. You don't want to be opening it up later to do that--cost of hose is minimal; cost of labor and time huge.
          NYC & L.I. - 1974 \"Classic\" Mako 20\' - Suzuki 2006 DF150 - Fly & Light Tackle, C&R[br]My boat: http://www.classicmako.com/forum/topic.asp?TOPIC_ID=23444#159594[br]Personal website: http://www.georgemcauliffe.com/

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          • #6
            quote:


            Originally posted by Prater


            Wife and I are making a decision to replace the tanks...better to be safe since we are this far into the project.


            RDS or Sunshine?


            I got mine from Sunshine. They were absolutely great to deal with!
            M20 project-Finally Splashed!
            https://forum.classicmako.com/forum/...r-bottom-paint
            Gallery
            https://forum.classicmako.com/member...kgfisher/media


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            • #7
              I am ordering an electric chainsaw to get the foam out. Anyone know the dimensions of the coffin box? Don't want to cut through it!!!
              Steven Kwajalein Atoll, RMI

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              • #8
                Anyone have the part numbers for the Mako 25 Fuel tanks? RDS wrote me back asking for the part number. I dont have a plate on my current tanks. Trying to get one ordered since it takes and extra two to four weeks to ship to the island once its done...

                Still waiting on a response from Sunshine.
                Steven Kwajalein Atoll, RMI

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                • #9
                  I don't think there are part numbers.

                  I measured my tank, and Sunshine had the original dimensions to confirm.
                  M20 project-Finally Splashed!
                  https://forum.classicmako.com/forum/...r-bottom-paint
                  Gallery
                  https://forum.classicmako.com/member...kgfisher/media


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                  • #10
                    No coffin box on the 25...so don't cut through the bottom! You are this far in, what's a couple more g's? []
                    1978 Mako 25 - Blind Hog
                    1985 Mako 20c - sold
                    Fort Walton Beach, FL
                    http://www.classicmako.com/forum/top...TOPIC_ID=42841

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                    • #11
                      I changed strategy, instead of the chainsaw I used a chemical called B-2000 from Fiberglass Coatings. I saw an episode of Ship Shape TV that mentioned using it for a tank removal. I used a 1/2 inch ships auger to drill holes all around the tanks and then poured a gallon of the cleaner around both tanks. I let it sit overnight. Next day I used a floor jack on some 4x4's to try and pull it out but just pulled the aluminum tabs out of place. I used a sharpened bar stock to make deeper holes closer to the front tank and then poured another 1/2 gallon of cleaner around it. I left pressure on the tank with the floor jack. Three days later and I noticed the tank had moved upwards. I was not able to use the jack anymore so I put the chain around my shoulders and the fill neck and pulled upwards. It felt like pulling your boots out of deep mud, 4th strong pull and the tank was out. I think the only reason the tank did not just slide out was the suction created by the soaked foam. the chemical turned the foam into the consistency of bed pillow foam all the way to freshly baked cake...it is hard to explain but I could just run my hand through the foam once the tank was out of the way.
                      Steven Kwajalein Atoll, RMI

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                      • #12













                        Steven Kwajalein Atoll, RMI

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                        • #13
                          Looks good.

                          Those are 100% original tanks, so good move to replace.

                          Although ugly, they do look to be in good shape. Mine were too, but once you've put the new one in, you're good "for life" so it's worth it.
                          ROGUE I[br]1978 235 CC[br]Newburyport, MA[br]ROGUE II[br]1987 17\' Montauk[br]Camden, ME[br]

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                          • #14
                            I had mine made for my 25 at Sunshine. Contact Lucy. Great people to work with and they will build them fast. They have all the original drawings so won't need dimensions.
                            \'07 Mako 19 bay, sold[br]\'76 Mako 21, sold[br]\'77 Mako 21, dump[br]\'77 Mako 22, sold[br]\'80 Mako 23 WA, sold[br]\'82 Mako 21, sold[br]\'85 Mako 254 currently[br]\'78 J24 USA 292 (sold)[br]\'05 Melges 32 racing sailboat

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                            • #15
                              Thanks Guys!!!
                              Steven Kwajalein Atoll, RMI

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