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  • fuel dump pumps.....

    anyone ever installed a fuel dump pump on one of these bikes......and whould i need to rejet....just wondering
    _____________________________________________ 1979 XS 1100 Special "The judge" mods- K&N air pods, 4-1 mac, 147.5 pilots, 57.5 mains, LED turn signal, cafe bars, HEL translucent yellow stainless steel brake line, dyna coil (dc2-1), raptor 660 mc, r6 controls..(sold)

    1982 gs1100e "all business" cafe project
    1980 gs1000g "stock"
    1982 honda express "stretched 10 inch(my daughters scooter)
    2008 jmstar 150cc Chinese scooter ( wife's bike)

  • #2
    What is a fuel dump pump?

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    • #3
      well i herd it from a friend who had one on his 92 gsxr 1100 (prevoisly installed buy prievouis owner)...... he told me it like a fuel pump but only engages on WOT.... and when it its WOT it just dumps a crap ton of fuel into the carbs....
      _____________________________________________ 1979 XS 1100 Special "The judge" mods- K&N air pods, 4-1 mac, 147.5 pilots, 57.5 mains, LED turn signal, cafe bars, HEL translucent yellow stainless steel brake line, dyna coil (dc2-1), raptor 660 mc, r6 controls..(sold)

      1982 gs1100e "all business" cafe project
      1980 gs1000g "stock"
      1982 honda express "stretched 10 inch(my daughters scooter)
      2008 jmstar 150cc Chinese scooter ( wife's bike)

      Comment


      • #4
        Why would you want to dump a "crap ton of fuel into the carbs?"
        Tim Ripley - Gaithersburg, MD
        1981 XS1100 Special "Spoiled Rotten" Just sold - currently bikeless!!
        23mm float height
        120 main jets
        42.5 pilot jets
        drilled stock airbox with K&N
        Jardine 4 to 1 Exhaust
        spade fusebox
        1st and 2nd gear fix

        Comment


        • #5
          These carbs can handle much higher air/fuel volumes than our engines can consume now... even at the 1196 bore. Simply adding fuel would richen things up and run like crap..


          Tod
          Try your hardest to be the kind of person your dog thinks you are.

          You can live to be 100, as long as you give up everything that would make you want to live to be 100!

          Current bikes:
          '06 Suzuki DR650
          *'82 XJ1100 with the 1179 kit. "Mad Maxim"
          '82 XJ1100 Completely stock fixer-upper
          '82 XJ1100 Bagger fixer-upper
          '82 XJ1100 Motor/frame and lots of boxes of parts
          '82 XJ1100 Parts bike
          '81 XS1100 Special
          '81 YZ250
          '80 XS850 Special
          '80 XR100
          *Crashed/Totalled, still own

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          • #6
            Such an item might be useful when using a nitrous boost as the NO2 leans things out rather significantly, other than that, can't think of a reason. have a nice day and ride safe
            I am the Lorax, I speak for the Trees

            '80 XS1100 SG (It's Evil, Wicked, Mean & Nasty)

            '79 XS1100 F R (IL Barrachino)

            '00 Suzuki Intruder 1400 (La Soccola)

            '77 KZ400s (La Putana)

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            • #7
              I don't know anything about Zuks but if there was a way to allow more air at WOT, then I can see adding more fuel. Maybe it's something similar to the V boost on the V Max?

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              • #8
                i just fughure maybe at high speeds (90+mph) these bike run lean
                _____________________________________________ 1979 XS 1100 Special "The judge" mods- K&N air pods, 4-1 mac, 147.5 pilots, 57.5 mains, LED turn signal, cafe bars, HEL translucent yellow stainless steel brake line, dyna coil (dc2-1), raptor 660 mc, r6 controls..(sold)

                1982 gs1100e "all business" cafe project
                1980 gs1000g "stock"
                1982 honda express "stretched 10 inch(my daughters scooter)
                2008 jmstar 150cc Chinese scooter ( wife's bike)

                Comment


                • #9
                  I've only had mine up to 85 mph (since that is what the speedo says!!) but I know it tachs about 5k at 70 mph and I have had it tacke dup to about 7500 in 5th gear. If the way it runs there is lean, I'd hate to feel if it was running right!
                  Life is what happens while your planning everything else!

                  When your work speaks for itself, don't interrupt.

                  81 XS1100 Special - Humpty Dumpty
                  80 XS1100 Special - Project Resurrection


                  Previously owned
                  93 GSX600F
                  80 XS1100 Special - Ruby
                  81 XS1100 Special
                  81 CB750 C
                  80 CB750 C
                  78 XS750

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                  • #10
                    I would assume that the way the tank is, gravity feed probably can't feed fast enough, so they added a small pump.

                    Dweebs might call it a 'dump pump'.
                    Nice day, if it doesn't rain...

                    '05 ST1300
                    '83 502/502 Monte Carlo for sale/trade

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                    • #11
                      Mine doesnt run lean at 100.Why would it?If the main jets are the right size. .
                      80 SG XS1100
                      14 Victory Cross Country

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                      • #12
                        If you were to take the gas tank and set it on a saw horse and the petcock were to be opened up accidentally you would find that the tank would be completely empty in just a couple of minutes DAHIK. There is no way, even at 100+ mph that the engine could handle that much fuel so why add a pump?
                        If one was to add one I am sure that you would have to redo all of the fuel lines to take the added pressure or you would be looking at leaks for sure.
                        The Old Tamer
                        _________________________
                        1979 XS1100SF (The Fire Dragon)
                        1982 650 Maxim (The Little Dragon)
                        another '82 650 Maxim (Parts Dragon)
                        1981 XS1100SH (The Black Dragon)

                        If there are more than three bolts holding it on there, it is most likely a very important part!

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                        • #13
                          even if one to put pod on the carb and and supertrapp..... with no rejet... would the engine need more fuel......there wouldnt need to be a rejet whould there... but im going to yamaha tomorrow because i got to pick up airfilter and also because they'r the ones who sold it to him so ill ask them about it...
                          _____________________________________________ 1979 XS 1100 Special "The judge" mods- K&N air pods, 4-1 mac, 147.5 pilots, 57.5 mains, LED turn signal, cafe bars, HEL translucent yellow stainless steel brake line, dyna coil (dc2-1), raptor 660 mc, r6 controls..(sold)

                          1982 gs1100e "all business" cafe project
                          1980 gs1000g "stock"
                          1982 honda express "stretched 10 inch(my daughters scooter)
                          2008 jmstar 150cc Chinese scooter ( wife's bike)

                          Comment


                          • #14
                            You would have to modify the carbs to allow the fuel to get into the mixture, and it would probably take much more work to get that right than to just rejet the carbs and you would get a much more reliable and consistent mixture (meaning more power) with the rejet.

                            Aux pumps are generally used with fuel injection to raise the pressure under boost or NOS conditions to push more fuel out the injectors without any other changes.
                            Cy

                            1980 XS1100G (Brutus) w/81H Engine
                            Duplicolor Mirage Paint Job (Purple/Green)
                            Vetter Windjammer IV
                            Vetter hard bags & Trunk
                            OEM Luggage Rack
                            Jardine Spaghetti 4-2 exhaust system
                            Spade Fuse Box
                            Turn Signal Auto Cancel Mod
                            750 FD Mod
                            TC Spin on Oil Filter Adapter (temp removed)
                            XJ1100 Front Footpegs
                            XJ1100 Shocks

                            I was always taught to respect my elders, but it keeps getting harder to find one.

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                            • #15
                              The term 'dump' pump is usually used to indicate a pump installed to allow the quick removal of fuel form the vehicle.

                              if your shipping a bike around, say for racing, it is recommended you empty the gas for transport...
                              Nice day, if it doesn't rain...

                              '05 ST1300
                              '83 502/502 Monte Carlo for sale/trade

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