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Thread: Twin fuel tank transfer switch

  1. #1
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    Twin fuel tank transfer switch

    Hi, I am getting an extra fuel tank for my 81 LWB Landy. part number 599233
    what I need is information on what transfer or switch to use. I don’t mind just transferring to main tank. Don’t need to be able to monitor secondary tank level. Any ideas appreciated.

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    Quote Originally Posted by RodCahill View Post
    Hi, I am getting an extra fuel tank for my 81 LWB Landy. part number 599233
    what I need is information on what transfer or switch to use. I don’t mind just transferring to main tank. Don’t need to be able to monitor secondary tank level. Any ideas appreciated.
    Miltary Series II's had a changeover tap to switch between tanks.
    You might struggle to find one of those but similar taps are available.

    Boat Marine Forged brass fuel tank three way selector valve | eBay

    My Series I uses two Facet electric pumps. The pumps have a non-return valve so they are just Tee'd into a line to the carby. I have a changeover switch on the dash that selects which tank to pump and also changes to the sender in that tank.
    Installed by a previous owner.

    DSCN2366 by Colin Radley, on Flickr

    There is also a fuel pressure regulator as the Facets are too high a pressure for the Holden carby fitted.

    My Defender also has twin tanks, on that there is a pump that lifts from the sill tank into the main tank. The sill tank has a sender and also a sensor that stops the pump if the fuel gets too low to save burning out the pump.



    Colin
    '56 Series 1 with homemade welder
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    '58 Series II (sold)
    Motorcycles :-
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    This is the type of 3 way tap my father fitted to his S3 think it may have come with the fuel tank kit he bought from JRA. Had it fitted near hand brake leaver so when driving & the engine gave a splutter, we could reach down reach down & change to other tank before the carby ran out of fuel.
    R (20)3 way tap.jpg

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    The ones above are the same type I got a couple of months ago.
    Relaxn 3 Way Fuel Valve | Outback Equipment

    whitehillbilly

  5. #5
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    I have this type fitted to my series 3 mines ex telecom Australia and I am sure some of the military vehicles had them too switch’s tanks and fuel senders and is mounted near hand brake
    1960 series 2 143001010
    1976 series 3 91331709c
    98 discovery 300tdi manual
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  6. #6
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    Quote Originally Posted by RodCahill View Post
    Hi, I am getting an extra fuel tank for my 81 LWB Landy. part number 599233
    what I need is information on what transfer or switch to use. I don’t mind just transferring to main tank. Don’t need to be able to monitor secondary tank level. Any ideas appreciated.
    We fitted an extra tank under the front seat of my daughters Series 3 Stage 1 with the V 8 engine so had to mount two valves one for fuel supply and one for fuel return. I purchased the valves from a marine chandler as I wanted good quality brass valves. The fuel gauge was set up by taking the power wire for the sender from the back of the gauge that normally went to the tank to a two way switch. The switch then went to the two senders independently so when the switch is up we know it’s front tank and down is back works a treat. The valves are set up the same they are currently in the back tank feed position. Like mentioned previously when the car splutters we can switch on the fly. They are mounted on the side of the drivers seat frame couldn’t put them under the front as we have dual battery isolation switch there.
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    Quote Originally Posted by Gippslander View Post
    We fitted an extra tank under the front seat of my daughters Series 3 Stage 1 with the V 8 engine so had to mount two valves one for fuel supply and one for fuel return.
    My IIA similarly has a brass valve to switch between the two tanks for fuel supply. The return line only runs to the left hand tank, so it has to be the one used first if both are full.

    I thought of incorporating a second valve, joined by a linkage to the first, to ensure that the return went back to the tank actually being used and avoided any chances of overflow (especially if another person was driving the motor car), but didn't bother in the end as it almost always runs on the left tank and nobody else ever drives it. Maybe I will change it one day. Or maybe I won't. The second valve would make it idiot-proof, but there is really only one idiot driving the Landy...

  8. #8
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    Both my 2a and my 110 have a tap very similar to the one in post #3. The 2a has a separate switch on the dash to change the gauge between tanks - I would prefer this to switches combined with the tap, as quite often I want to check how much fuel is in the tank I am not using, for example, to see whether I want to top up both tanks.

    The 110 has two fuel gauges. The 2a is petrol so no return line.

    On the 110, both tanks share a common filler, with a "Y" just below the cap, and the main tank overflows into the second tank if the return line overfills it. The second tank is a belly tank occupying the unused space inside the chassis to the left of the prop shaft, between the A-frame crossmember and the transfer case, taking advantage of the Isuzu exhaust system being entirely outside the chassis rail. It holds 60l.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

  9. #9
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    Quote Originally Posted by JDNSW View Post
    Both my 2a and my 110 have a tap very similar to the one in post #3. The 2a has a separate switch on the dash to change the gauge between tanks - I would prefer this to switches combined with the tap, as quite often I want to check how much fuel is in the tank I am not using, for example, to see whether I want to top up both tanks.
    I had the same for a long time: a switch on the dash to change which tank the gauge measured. It was easy to flick the toggle switch to check either tank. Later, I changed it to two separate guages, which I have preferred: the gauge for the tank with the return line is the more accurate of the two and lets me know exactly how much fuel has run back to it if I am using the other tank.

  10. #10
    JDNSW's Avatar
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    That is effectively what i have on the 110.
    John

    JDNSW
    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

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