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Thread: Fuel Gauge Sender

  1. #1
    Join Date
    Mar 2013
    Location
    Bemm River
    Posts
    808

    Fuel Gauge Sender

    Iím after some help please why are these two units different
    the new one I bought has three terminals where the old one has one terminal
    do I only use one terminal on the new unit.....if so which one

    F9032752-6AF3-4A26-87F5-FB3835EF81B7.jpg

    Cheers Paul
    Puma 90........Ruby
    Puma 130......Pearl
    Series 2a 88............Jade

    2 x Series 2a 109 Holden 202 hardtop +Series 3 2.25 109 to be morphed into two Series2a 109 goers , if I can find them under all the rust

  2. #2
    Join Date
    Aug 2013
    Location
    Kadina SA
    Posts
    74

    fuel gauge

    Bemm,your new sender possibly has a feed,an earth(where the old ones earthed through the screws and a low fuel light terminal),Which terminal is which I cannot tell you atm.Could have done with the low fuel light today.Ran out of fuel in the empty tank,gauge showing full,200mtrs from servo.Blonde moment....Now have 2 full tanks and nowhere too travel.
    WKSP rover 178058 , WKSP trailer 178025, Wksp trailer 101755,Wksp trailer 178023, 1977 ser 3 swb. GS Perentie gone to the USA.

  3. #3
    Join Date
    Feb 2018
    Location
    East Gippsland
    Posts
    93
    Hi Bemm
    I am just on the very same - series 2a neg earth.
    I have figured that the 3 terminal one - the centre goes to the gauge and the one outside is earth. If itís the same as mine it is plastic and therefore needs an earth.
    The single terminal is metal so no earth required. The problem is that it presumes the tank is well earthed, so I would add an earth wire to the unit to be sure.
    I have just faced the empty showing full and the full empty. I now need to bend the wire accordingly- letís see how that goes.

  4. #4
    Join Date
    Mar 2013
    Location
    Bemm River
    Posts
    808
    Quote Originally Posted by Ricrose View Post
    Hi Bemm
    I am just on the very same - series 2a neg earth.
    I have figured that the 3 terminal one - the centre goes to the gauge and the one outside is earth. If itís the same as mine it is plastic and therefore needs an earth.
    The single terminal is metal so no earth required. The problem is that it presumes the tank is well earthed, so I would add an earth wire to the unit to be sure.
    I have just faced the empty showing full and the full empty. I now need to bend the wire accordingly- letís see how that goes.
    I posted this on the Pomie Series 2 forum and got the same answer as previous post
    one terminal earth
    one terminal gauge
    one terminal low fuel warning light
    However they also said the sender I pictured needs a voltage stabiliser to cynic with gauge correctly and the gauge needs a flat needle rather than the pointy one
    Im interested in your progress with this, Iím kinda stockpiling information and bits for soon not quiet at that stage yet (2a positive earth)

    Cheers Paul
    Puma 90........Ruby
    Puma 130......Pearl
    Series 2a 88............Jade

    2 x Series 2a 109 Holden 202 hardtop +Series 3 2.25 109 to be morphed into two Series2a 109 goers , if I can find them under all the rust

  5. #5
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    23,939
    Further clarity to the above.

    Fuel gauges and senders changed with the change to negative earth with 2a chassis suffix 'c' in 1967. The two types are not interchangeable and the gauge/sender cannot be mixed. The later negative earth type needs an external voltage regulator.

    Plastic body senders will need a separate terminal for an earth wire.

    Diesel senders have an extra terminal for a fuel warning light, but are otherwise identical to the petrol one.
    John

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

  6. #6
    Join Date
    Jul 2016
    Location
    Gold Coast
    Posts
    467
    Quote Originally Posted by JDNSW View Post

    Diesel senders have an extra terminal for a fuel warning light, but are otherwise identical to the petrol one.
    I wonder what the logic is there ? i.e. why not for petrol too ???

    Cheers,
    John

  7. #7
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    23,939
    The logic was that if you run out of fuel in a petrol one, you simply refill it from your jerrican, whereas a diesel you have to bleed after running out of fuel.

    I had never seen a low fuel light in a car before my father got a Simca Vedette in 1959, but this was very much an isolated instance. The first car I have owned with one was my first diesel Landrover, and for years this and my father's car were the only ones I had ever seen. They did not become common in petrol vehicles until long after Series production ended, but have always been common on diesels, at least since WW2.
    John

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

  8. #8
    Join Date
    Feb 2018
    Location
    East Gippsland
    Posts
    93
    I have been reading this with interest - having the same problem.
    When I sorted the tank I removed the sender which was really looked very corroded and bad.
    I ordered a cheapie from the UK as part of one of my orders ages ago. When I installed it last month it read backwards. I phoned a local supplier and ordered a better one thinking that was the problem. No better.
    Getting frustrated I cleaned up the old one with a wire wheel and contact spray and it works like a charm!
    There has to a moral on that story!

  9. #9
    Join Date
    Jan 1970
    Location
    Central West NSW
    Posts
    23,939
    I would guess you have a pre-1967 system, and most, if not all, of the senders available today are aimed at Series 3 and post 1967 Series 2a.
    John

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

  10. #10
    Join Date
    Feb 2018
    Location
    East Gippsland
    Posts
    93
    Correct - 1965 beg earth.

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