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  • Reserve fuel tank

    Hi guys,
    How does the reserve and main tank work together? Is it simply two tanks connected together (as one big tank) and each level reduces evenly? Or are they separated and fuel is pumped from the reserve to the main tank?, or some other mechanism or process of which tank is fed from at which point. I have read various things on the internet.
    Can anyone provide some clarification (I am assuming option 1)

    Eddie

  • #2
    i think option 3
    seperate tanks, will use from main tank and auto switch to reserve tank when main tank is low.
    Well thats how my car works.

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    • #3
      There is a separate thread on the Scanguage codes need to monitor the fuel level in each tank. The fuel transfer method is also discussed there.

      Fuel is drawn from the main tank, which in turn draws fuel from the auxiliary tank (through a filter mounted under the vehicle) until the aux tank is empty. Then the fuel level in the main tank will begin to drop. When you refuel, the auxiliary tank fills first.

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      • #4
        Thanks guys,
        Transferring from the reserve seems to make sense which is why it says 90 litre's (main tank capacity, as reserve is less capacity) when the gauge changes to indicate one tank. If this is the case then transfer pump must work darn fast when filling both tanks?.
        Cheers guys.

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        • #5
          There isnt a pump between the tanks
          Prado 150 V6 2010 Kakadu, Factory towbar, GME TX3420, P3 Brake Controller, ABR Battery tray, D34 Optima battery (Drivers side), Fullriver AGM 100Ah, Rear Anderson plug, Rear internal power outlets, Baintech rear battery monitor, Kaymar Wheel on Door bracket, GME UHF Antenna, Sand Grabba mats

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          • #6
            Originally posted by blw View Post
            There isnt a pump between the tanks
            There is. Its a venturi pump which uses the flow of fuel returning from the injector rail to draw fuel from the reserve into the main. It constantly is moving fuel from second tank to first while the engine is running. The excess just flows back to the second tank. The indicator light is actually showing that the second tank is empty and gauge changes to reflect this.

            https://www.pradopoint.com.au/forum/...y-explanations

            https://www.pradopoint.com.au/forum/...ent-dual-tanks


            Last edited by sparksy; 12-06-2019, 02:02 AM.

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            • #7
              Venturi using the returned fuel, very clever, no moving parts to wear out. No problem having stale fuel in one tank.
              Thanks for the discussion and sharing the knowledge guys.

              Eddie

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              • #8
                Originally posted by RPP View Post
                There is a separate thread on the Scanguage codes need to monitor the fuel level in each tank. .
                sorry mate but where is that?. Ive had a browse and Ive been unable to find it

                11/06 kdj120 gx wide body auto

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                • #9
                  Its here:

                  https://www.pradopoint.com.au/forum/...-fuel-directly

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                  • #10
                    thanks kindly mate

                    I will give it ago
                    11/06 kdj120 gx wide body auto

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                    • #11
                      Ive entered it in but its not showing anything.

                      Tank is nearly empty anyway, also I didnt drive the car, will do tomorrow arvo
                      11/06 kdj120 gx wide body auto

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                      • #12
                        The codes are working for my Prado 150 - 2.8l 1GD.

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