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12 volt fuel pump for my 1989.125 Force outboard

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  • 12 volt fuel pump for my 1989.125 Force outboard

    heya all ,...I recently bought an old school 12 volt fuel pump from an auto parts store..$42.00 , so I could remove the fuel that has been in the tank of the boat pictured below since 1997, and not spit varnish for the rest of the day...(siphoning it the old school way)...it worked like a champ...my outboard has two carburetors,... any reason I can't use it to feed the engine? I ask because of all I have read about ethanol , and older Force outboard fuel pumps not getting along well with ethanol...... the electirc pump is paid for already and I can either wire it with a fuse to the key on position, or a fused auxilliary switch that is at present not employed on my helm...eliminating the primer bulb would be a plus as well..Thanks in advance brothers....
    “Success has many fathers, but failure is an orphan.”
    John F. Kennedy





    sigpic1990 Bayliner 2002 Capri Cuddy /125 Force " Breaking Wind "


  • #2
    Re: 12 volt fuel pump for my 1989.125 Force outboard

    The output pressure of the electric fuel pump seems like it would screw up the operation of the floats. I don't know just sounds scary to me, I/O's I've heard of being converted ok, just havent heard too much about outboard conversions.
    '90 Chaparral 2000SL
    5.8 Cobra
    '67 MFG Westfield Regal
    80hp V-4
    (No private messages)

    Comment



    • #3
      Re: 12 volt fuel pump for my 1989.125 Force outboard

      The problem is shutting off the electric pump automatically if the engine stalls by accident. No good way to do it on a non-computer controlled 2 stroke engine. Four-strokes get wired to the oil pressure sensor.
      Please no PMs. My mailbox is full anyway......

      Comment



      • #4
        Re: 12 volt fuel pump for my 1989.125 Force outboard

        well , they were originally designed to feed carbureted engines...with float valves... they shut off at a preset pressure...they worked wonders on the 1960's era doghouse engined work vans that would vapor lock...just wondered if anyone had any actual experience with them on a boat
        “Success has many fathers, but failure is an orphan.”
        John F. Kennedy





        sigpic1990 Bayliner 2002 Capri Cuddy /125 Force " Breaking Wind "

        Comment



        • #5
          Re: 12 volt fuel pump for my 1989.125 Force outboard

          Originally posted by tx1961whaler View Post
          The problem is shutting off the electric pump automatically if the engine stalls by accident. No good way to do it on a non-computer controlled 2 stroke engine. Four-strokes get wired to the oil pressure sensor.
          if the engine stalls, the back pressure to the pump from the float valve , is what shuts it off...thats how they work
          “Success has many fathers, but failure is an orphan.”
          John F. Kennedy





          sigpic1990 Bayliner 2002 Capri Cuddy /125 Force " Breaking Wind "

          Comment



          • #6
            Re: 12 volt fuel pump for my 1989.125 Force outboard

            Originally posted by Stachi View Post
            if the engine stalls, the back pressure to the pump from the float valve , is what shuts it off...thats how they work
            this is not a high pressure pump as are used in fuel injected engines (35 psi minimum)...this is a volume pump by design...it was designed for carburetors , hence the back pressure shut off... you turn the key , listen for it to chug for a second or two , wait for it to stop , and then choke and crank the engine.....does not sit in the tank , can be mounted anywhere you like (fuel line barbs at each port)...it only operates when the pressure drops ( the float valve opening)
            “Success has many fathers, but failure is an orphan.”
            John F. Kennedy





            sigpic1990 Bayliner 2002 Capri Cuddy /125 Force " Breaking Wind "

            Comment



            • #7
              Re: 12 volt fuel pump for my 1989.125 Force outboard

              I understand that, I guess if you knew the pressure of the outboards fuel pump and the electric pump, as long as they matched, but the difference between 1lb and 8 lbs could cause the needle to lift off it's seat.
              '90 Chaparral 2000SL
              5.8 Cobra
              '67 MFG Westfield Regal
              80hp V-4
              (No private messages)

              Comment



              • #8
                Re: 12 volt fuel pump for my 1989.125 Force outboard

                Originally posted by a70eliminator View Post
                I understand that, I guess if you knew the pressure of the outboards fuel pump and the electric pump, as long as they matched, but the difference between 1lb and 8 lbs could cause the needle to lift off it's seat.
                I agree,...it would be a good idea to find the values of the float valve...I guess pump volume will tell the story, mechanical vs. electric pump, if the numbers match , I may be ok....I have a feeling that a leak in a hose or connection could become a VERY hazardous condition,.... I don't need to install it as I know of right now...just exploring the idea...all input is appreciated...
                “Success has many fathers, but failure is an orphan.”
                John F. Kennedy





                sigpic1990 Bayliner 2002 Capri Cuddy /125 Force " Breaking Wind "

                Comment



                • #9
                  Re: 12 volt fuel pump for my 1989.125 Force outboard

                  Originally posted by Stachi View Post
                  this is not a high pressure pump as are used in fuel injected engines (35 psi minimum)...this is a volume pump by design...it was designed for carburetors , hence the back pressure shut off... you turn the key , listen for it to chug for a second or two , wait for it to stop , and then choke and crank the engine.....does not sit in the tank , can be mounted anywhere you like (fuel line barbs at each port)...it only operates when the pressure drops ( the float valve opening)
                  Go ahead. Sounds like it will work fine for normal operation. It's the abnormal operation that you have to watch out for. If the float sticks and the engine stalls, the pump will not shut off and you'll be pumping gas into into the cowl. Same deal with a split fuel line.
                  Please no PMs. My mailbox is full anyway......

                  Comment



                  • #10
                    Re: 12 volt fuel pump for my 1989.125 Force outboard

                    Not only will it pump fuel into the cowl, but it may pump fuel into the engine. Hit the key to start it and you may have ---- well ---- does "kaboom" mean anything to you. You must have an automatic shut off should the engine stall (yes - with a defective carb needle and seat or any other reason). This will work -- until the day when you actually experience the above issue. You are indeed tempting fate.

                    Comment



                    • #11
                      Re: 12 volt fuel pump for my 1989.125 Force outboard

                      Originally posted by tx1961whaler View Post
                      Go ahead. Sounds like it will work fine for normal operation. It's the abnormal operation that you have to watch out for. If the float sticks and the engine stalls, the pump will not shut off and you'll be pumping gas into into the cowl. Same deal with a split fuel line.
                      I am currently restoring my boat and engine..no system goes without a full refit ...including new fuel lines... safety first....also,I am an ASE Certified Automobile Mechanic by trade so I know a thing or two, about a thing or two...lol... I'm more concerned with a float failing before a float valve breaks...never seen one break...hang up , yes...float failing because it leaks.. yes...I am going to look for a limiting valve...like they have developed for washing machines... it is located at the hot or cold water supply connection in new washing machine hoses sold today.....if the hose breaks beyond the valve, the volume of water through it closes the valve....they developed it when washer/dryers were installed on the second floor of houses...to limit the damage to the insurers when a supply hose leaks...... if I can find it for this application, it will be installed at the pump.If it is not available , maybe I will scrap the idea...good input from all and Thank You.
                      If anyone knows of a valve for this application , please let me know...Thanks all
                      “Success has many fathers, but failure is an orphan.”
                      John F. Kennedy





                      sigpic1990 Bayliner 2002 Capri Cuddy /125 Force " Breaking Wind "

                      Comment



                      • #12
                        Re: 12 volt fuel pump for my 1989.125 Force outboard

                        Sounds like a solution in search of a problem to me. New replacement fuel pump diaphragms should be fine with E10.
                        Bob, Orange County NY
                        '88 Bayliner 1700 Capri Bowrider, 85 HP Force O/B, "Sea Weasel"
                        Want a vessel safety check? Click here. Want to join the Coast Guard Auxiliary? Click here.
                        Disclaimer: Although I am a member of the USCG Auxiliary, the opinions and advice in my replies are my own and do not necessarily reflect CG or CG Auxiliary policy or regulations unless so specified.

                        Comment



                        • #13
                          Re: 12 volt fuel pump for my 1989.125 Force outboard

                          lol... good point...the pump is paid for , if I can find the valve and be safe......
                          “Success has many fathers, but failure is an orphan.”
                          John F. Kennedy





                          sigpic1990 Bayliner 2002 Capri Cuddy /125 Force " Breaking Wind "

                          Comment



                          • #14
                            Re: 12 volt fuel pump for my 1989.125 Force outboard

                            Just my 2 cents....but.......Don't Do It !!!!
                            Scarey stuff. Stick with what the motor was designed for.
                            sigpicMarada 2100 Executive Series, 5 Litre V8 with Mercruiser Alpha 1 outdrive. 2007 K-Z Spree 260 RBH, all = a whole lot of family fun !!!!

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                            • #15
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                              Re: 12 volt fuel pump for my 1989.125 Force outboard

                              Off topic but you said your doing some restoration work to your boat. As we have the same model of Bayliner, I would be interested in seeing some pictures. If you need any measurements from mine let me know.

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