Dual Fuel Tank set up

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  • Imogene
    Low Range
    • Jan 2017
    • 3
    #1

    Dual Fuel Tank set up

    Hey everyone. I am trying to figure out how my duel fuel tank works. Under the middle seat, near the overdrive, I have a lever that controls the right and left tanks. Does anyone know how these work? Do I move to the right, fill it up, and then move it to the left to fill that tank up?

    I just filled up what I thought was just the right tank, but it started to leak through the left after I put in about 10 gallons - might have been through the connectors and not the tank itself.

    Are there any diagrams on how these systems work?

    Thanks!
    Tags: fuel tank, series 2a
    • mrmoose
      Low Range
      • Sep 2016
      • 35
      #2
      Mine is not a dual tank setup but if you crawl under your truck then you will see how it all works clear as day.
      1966 Series IIA
      A Little rough around the edges... And everywhere else.

        Comment

        • siii8873
          Overdrive
          • Jul 2007
          • 1011
          #3
          all the control lever is on a dual tank setup is a two position valve. in left position it opens the port to left tank and shuts port to right tank and vice-versa. It shouldn't open a path between the tanks. You could have a leaky valve the cork seal on these dries out and you may be leaking from there. But I think you would need to fill the tank right up past top for fuel to get to the valve without pump running. Maybe it could create a syphon condition with a leaky valve and full tank.
          THING 1 - 1973 88 SIII - SOLD
          THING 2 -1974 88 SIII Daily Driver - SOLD
          THING 3 - 1969 88 SIIA Bugeye Project
          THING 4 - 1971 109 SIIA ExMod - SOLD
          THING 5 - 1958 109 PU
          THING 6 - 1954 86" HT

            Comment

            • siii8873
              Overdrive
              • Jul 2007
              • 1011
              #4
              filling the tanks is independent of valve. Not sure your vintage of vehicle but typically the left tank is filled from under the seat and right tank from normal fill cap on side of the vehicle. All valve does is change where the pump is drawing its fuel in operation.
              THING 1 - 1973 88 SIII - SOLD
              THING 2 -1974 88 SIII Daily Driver - SOLD
              THING 3 - 1969 88 SIIA Bugeye Project
              THING 4 - 1971 109 SIIA ExMod - SOLD
              THING 5 - 1958 109 PU
              THING 6 - 1954 86" HT

                Comment

                • SafeAirOne
                  Overdrive
                  • Apr 2008
                  • 3435
                  #5
                  Originally posted by Imogene
                  I just filled up what I thought was just the right tank, but it started to leak through the left after I put in about 10 gallons
                  What does "it started to leak through the left" mean? The left what? The left tank was leaking? The left side of the valve was leaking? The plumbing to the left tank was leaking?

                  Either way, like Bob says: If the valve is good, there should never be any cross-flow between the tanks (otherwise, your fuel pump would be sucking air from the empty tank along with a bit of fuel from the non-empty tank, and fuel systems don't like air in the lines, generally).
                  --Mark

                  1973 SIII 109 RHD 2.5NA Diesel

                  0-54mph in just under 11.5 minutes
                  (9.7 minutes now that she's a 3-door).

                    Comment

                    • cedryck
                      5th Gear
                      • Sep 2010
                      • 836
                      #6
                      The changeover switch also determines the reading on your fuel gauge on the dash, depending on which tank is being used.

                        Comment

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