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converting to fuel pump on 1957 johnson seahorse

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  • converting to fuel pump on 1957 johnson seahorse

    We have model RDE-19 C Johnson Seahorse 35hp and we have been trying to get it going. (It was given to us) Anyway everything seems pretty good we even got the pressure tank but it has no fittings and the only ones I see online are around $95.00 for each and we need both ends. So we were wondering if it will be cheaper to convert it to the regulas gas tank type but I guess you have to add a fuel pump? Does anyone have any info or suggestions about this? Ive seen online about converting a smaller hp engine but nothing over 20hp so im wondering if you even can on these? Thanks in advance.


  • #2
    Re: converting to fuel pump on 1957 johnson seahorse

    Screw the fittings..run lines right to the carb and the hell with it. Ya ain't gonna pull the motor off daily, and just refill the tank with a separate gas can. Laings outboards had new twin hose cheap, or just go to an auto store and get new hoses.

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    • #3
      Re: converting to fuel pump on 1957 johnson seahorse

      a agree with Scatty, just order some 2 line hose from Laingsoutboards.com, and 4 hose clamps, you in business. besure to get the air and gas line in the correct position. got mine backwards once. i find it highly foolish, to change a technology that has proven itself for over 50 years. just bought a 58 35 johnny. remember it's a 24-1 fuel/oil mixture.
      FLORIDA GATORS
      TEBOW Country



      Please, NO PM's (Private Messages) regarding boat/engine problems. they will not be answered.
      That is what these forums are for. Post your questions, in the appropriate Forum.

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      • #4
        Re: converting to fuel pump on 1957 johnson seahorse

        Good suggestions so far. If you're really keen on a two-line quick disconnect fitting, keep an eye on the auction site for one...stuff like that comes up all the time. You can put a fuel pump on it, but if you have a functional pressure tank why bother? Converting will cost you close to $75 if you can find the parts used, then put a rebuild kit in them. Then you have to buy a modern tank and lines unless you have those already.

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        • #5
          Re: converting to fuel pump on 1957 johnson seahorse

          People sell those pressure tanks on ebay all the time not realizing how valuable the female fuel fitting attatched to it is. Take the fuel fitting off and turn around to sell the tank right back on ebay. Just keep your eye out. I see them go for about 40 to 50 bucks frequently. Laings sells the male ends for cheap. He's also got the replacement 0-rings for the female fuel fitting if it needs them. Good luck.
          “We do not inherit the earth from our fathers, we are borrowing it from our children.”

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          • #6
            Re: converting to fuel pump on 1957 johnson seahorse

            Thanks for all the good suggestions, you all are great!
            I think we might have found a pressure tank with the fittings, we are biddding on it right now. I'll let you all know!

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            • #7
              Re: converting to fuel pump on 1957 johnson seahorse

              are you bidding against me. i bidding on a second tank for my 58 35. i've submitted my highest bid, good luck.
              FLORIDA GATORS
              TEBOW Country



              Please, NO PM's (Private Messages) regarding boat/engine problems. they will not be answered.
              That is what these forums are for. Post your questions, in the appropriate Forum.

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              • #8
                Re: converting to fuel pump on 1957 johnson seahorse

                Originally posted by Drowned
                People sell those pressure tanks on ebay all the time not realizing how valuable the female fuel fitting attatched to it is. Take the fuel fitting off and turn around to sell the tank right back on ebay. Just keep your eye out. I see them go for about 40 to 50 bucks frequently. Laings sells the male ends for cheap. He's also got the replacement 0-rings for the female fuel fitting if it needs them. Good luck.
                Can't agree here on ebay tanks. The connector is on the hose end, just clamps to most tanks pump nipples. The people buying them see or ask if it has the female connector, and with a decent tank go for close to a hundred anyway. Decent tanks are 40 -50. Just sold 2 totally repainted and clean with new gaskets. Male fittings are cheap (I have one if someone needs one) email me hogrider@myway.com

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                • #9
                  Re: converting to fuel pump on 1957 johnson seahorse

                  Originally posted by tashasdaddy
                  a agree with Scatty, just order some 2 line hose from Laingsoutboards.com, and 4 hose clamps, you in business. besure to get the air and gas line in the correct position. got mine backwards once. i find it highly foolish, to change a technology that has proven itself for over 50 years. just bought a 58 35 johnny. remember it's a 24-1 fuel/oil mixture.
                  Wow Bob, just sold off all good parts (which were just about all) from a 58 RDS 20 35hp. Had a mess of good parts. Scattered all over the US and Canada now

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                  • #10
                    Re: converting to fuel pump on 1957 johnson seahorse

                    i sold one 3 months ago not knowing i'd ever need it. still have 1 i rebuilt. i like having enough fuel for the day.
                    FLORIDA GATORS
                    TEBOW Country



                    Please, NO PM's (Private Messages) regarding boat/engine problems. they will not be answered.
                    That is what these forums are for. Post your questions, in the appropriate Forum.

                    Comment



                    • #11
                      Re: converting to fuel pump on 1957 johnson seahorse

                      Yeah, I meant ones that have the fitting on there. You can usually see it in the photo. I've bought two tanks that way.
                      “We do not inherit the earth from our fathers, we are borrowing it from our children.”

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                      • #12
                        Re: converting to fuel pump on 1957 johnson seahorse

                        That Fitting I Saw It Listed For $ 136.00

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                        • #13
                          Re: converting to fuel pump on 1957 johnson seahorse

                          I'd convert the motor. Its easy, inexpensive, and you can use a very large variety of tanks with your motor.

                          There is a "sticky thread" here, on how to do it. The "cliff notes version" is that you can use a bypass cover off of a later year 28hp/33hp motor, or you can use the original bypass cover.

                          If you use the 28hp/33hp bypass cover, the procedure is a simple swap and mounting of a new fuel pump. If, on the other hand, you use the original, you will have to drill out the center "boss" (all three are actually there, but were never drilled) all the way through the cover, and the mounting bosses part way through. Those mounting bosses then need to be tapped for the mounting screws.

                          One peculiarity of the old covers, is that the mounting/pulse bosses are molded very slightly higher into the bypass cover, than is true on the newer ones. Because of this, the Throttle Control Rod (steel rod, port side of motor) will hit the top of the fuel pump if it is mounted right side up. The fix is easy, just mount the fuel pump upside down.

                          If you make the conversion, don't forget to remove the nipple on the lower portion of the intake manifold, which is the source of pressure for the hose/pressure tank. You will have to plug it will a small bolt of the appropriate size, thread count and length ..... do not use a screw that is too long because it will hit the Leaf Plate, located behind the intake cover (internal), if you do!
                          Please don't PM me on advice issues - let's keep that in the forums, so that everyone can benefit. Please note that I do not email PDFs, etc. I have a bandwidth limited aircard for internet access. My avatar does not mean I have any offical link to iboats. I just like it!

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                          • #14
                            Re: converting to fuel pump on 1957 johnson seahorse

                            i took a 6 gallen johnson tall boy to the dump a year ago... it was gnarly...but now i am haveing the darnest time finding a new one...

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                            • #15
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                              Re: converting to fuel pump on 1957 johnson seahorse

                              Click image for larger version

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ID:	105170outdated thread cob, but is this what you refer to as a "tall boy" tank?
                              many men fish for years without ever knowing its not about catching one.

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