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Running In tank walbro 255 with external pump

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    Running In tank walbro 255 with external pump

    Quick question.

    I've got an early model with dual pump setup. Currently run a 255 in tank and was just going to eliminate the stock external.

    But I have a brand new external pump sitting here...

    Would I be better off bypassing the external pump or installing the new external pump?

    This is feeding a 400+ whp turbo m20

    Last dyno session we had to cut short due to fuel issues.... I don't want that to happen again.

    Sent from my Galaxy Nexus using Tapatalk 2
    -Build http://www.r3vlimited.com/board/showthread.php?t=295277

    #2
    Was going to run same set up ,only the exsternal pump was a bosch 044 ,but the tuner guy just use in tank walbro

    Comment


      #3
      You have to compare the flow rates/pressures of both pumps. If your external cannot pump as fast as your internal that would create flow back pressure problem.

      Comment


        #4
        Thanks.

        So bypass the external.

        Sent from my Galaxy Nexus using Tapatalk 2
        -Build http://www.r3vlimited.com/board/showthread.php?t=295277

        Comment


          #5
          Yes, the 255 should be sufficient enough.

          Comment


            #6
            don't you have to find another pump carrier though?
            2014 Alpine White 335i MSport
            (Daily Driver)
            Full Mperformance Aero

            2007 Black Sapphire Metallic E92 335i (6MT)
            KW V2 Coilovers
            VRSF Catless Downpipes

            Comment


              #7
              Pump carrier for what? The in tank? No just had to shorten the metal line that the pump connects too. Soldered the wires to the stock connector. Done.

              As for the external bypass I have double barb fittings for that.

              Sent from my Galaxy Nexus using Tapatalk 2
              -Build http://www.r3vlimited.com/board/showthread.php?t=295277

              Comment


                #8
                so you by pass the return line too?
                2014 Alpine White 335i MSport
                (Daily Driver)
                Full Mperformance Aero

                2007 Black Sapphire Metallic E92 335i (6MT)
                KW V2 Coilovers
                VRSF Catless Downpipes

                Comment


                  #9
                  No didn't have to touch the return line.

                  Original setup is return line goes into the tank connects to bottom of pump as seen here (bottom left)



                  Now it just goes in the tank. Pump connects just like old one to the output. Hose clamped it to the return line to hold it in place.

                  Sent from my Galaxy Nexus using Tapatalk 2
                  -Build http://www.r3vlimited.com/board/showthread.php?t=295277

                  Comment


                    #10
                    nice, where did you find the pump the cheapest? One of my pumps is going out, and would rather not pay for the expensive bosch.
                    2014 Alpine White 335i MSport
                    (Daily Driver)
                    Full Mperformance Aero

                    2007 Black Sapphire Metallic E92 335i (6MT)
                    KW V2 Coilovers
                    VRSF Catless Downpipes

                    Comment


                      #11
                      "tre" seems to have the best deal. I'm on my phone but if you don't find it I'll link you up later tonight

                      Sent from my Galaxy Nexus using Tapatalk 2
                      -Build http://www.r3vlimited.com/board/showthread.php?t=295277

                      Comment

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