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Thread: Electrickery question

  1. #1
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    Electrickery question

    Hi Guys

    I took "Rangella" 84 RRC duel fuel from Canberra up through the Brindies to Adaminaby on the weekend and when I tried to change back to petrol from gas discovered that the petrol pump had ceased to function. Upon investigation the live feed wire had either burnt out through a short or somehow contacted the exhaust and disintegrated. Anyway, I need to rewire it. does anyone know (of course they do!) where the fuel pump wire is connected? Rightly or wrongly the fuel pump was constantly running regardless if it were running on LPG or petrol so long as the key was "on". I stupidly pulled on the burnt wire and it came away in my hands without me having a chance to trace it back.
    Second question, where in the name of all that's holy is the bloody fuse box? I've searched every logical place. I was surprised that nothing else stopped with the fuel pump, surely it would have blown a fuse when the wire shorted???

    Thanks in anticipation!

    Jez

  2. #2
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    I guess there should be a switch and relay for the fuel pump to turn on/off when switching to gas? If not look around for the white wire with an orange trace that will be the 12V switched coming from the ignition. By the sounds of it something is wrong and the fuel pump circuit has been left standard and the lpg just piggy backed on.

    Cheers
    Craig

  3. #3
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    Quote Originally Posted by cdbanks View Post
    I guess there should be a switch and relay for the fuel pump to turn on/off when switching to gas? If not look around for the white wire with an orange trace that will be the 12V switched coming from the ignition. By the sounds of it something is wrong and the fuel pump circuit has been left standard and the lpg just piggy backed on.

    Cheers
    Craig
    Could well be Craig, There are a lot of dodgy things about Rangella! I'm gradually sorting them. If I can just find the fuses!

  4. #4
    Davo is offline ChatterBox Silver Subscriber
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    On an '84 it should be under the bonnet, in the far LH side of the engine bay, on the bulkhead.
    At any given point in time, somewhere in the world someone is working on a Land-Rover.

  5. #5
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    1. Carby fuel pumps run off a wire that runs down past the gearbox from memory. It runs off the same wire (no fuse at all? wire feeding the ignition coil) that runs everything on the ignition side. It should appear at the multi plug behind the engine. The last carby RRC I gas converted I cut this wire to go to the selector switch and rewired the coil for electronic ignition.

    2. The fuse box should be under the bonnet behind a plastic cover on the passenger side firewall from memory.

  6. #6
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    Tell me about it mate. I am rewiring my range rover at the moment and success is measured by how many metres of dodgy wire I pull out in a day.

    Maybe you should have a go at fully rewiring the lpg yourself? Get your hands on a rave cd and read up on lpg systems a bit and have a go. Wont hurt to learn something new and next time something goes wrong you will know the system inside out.

    Craig

  7. #7
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    I shall have another look for that fuse box! I assumed it would be obvious AND on the inside... Wrong. Thanks Bee Ute, I will now have some clue as to where to pick up on that wire. No fuse though No wonder it melted!

    Where can I get a copy of the RAVE CD? And Craig, you are a brave man

  8. #8
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    G`day ,

    if a phase 2 BA model 84 with the tacho dash , coz you`ve not found it under the bonnet i guess it is ?

    The fuses are under the rectangular cover on the pass side , which is the opposite place to where the hazard , interior , fog , heater switches are .

    White wire from pump past rear heater branch past ignition amp branch to ignition switch .

    Black wire from pump to capacitor .

    If the pump runs all the time as you say and it uses carbys it should not be able to run on lpg unless something else is amiss because they won`t run both fuels at the same time , it would be usual for an EFI car to have the pump run all the time ?

  9. #9
    Davo is offline ChatterBox Silver Subscriber
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    Quote Originally Posted by cdbanks View Post
    Tell me about it mate. I am rewiring my range rover at the moment and success is measured by how many metres of dodgy wire I pull out in a day.

    Maybe you should have a go at fully rewiring the lpg yourself? Get your hands on a rave cd and read up on lpg systems a bit and have a go. Wont hurt to learn something new and next time something goes wrong you will know the system inside out.

    Craig
    I've been doing this for the last week . . . or so . . . I can't remember . . . (sob!) I'm not even completely rewiring it, just cleaning up dodgey former owner work and adding some gauges.
    At any given point in time, somewhere in the world someone is working on a Land-Rover.

  10. #10
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    Quote Originally Posted by PLR View Post
    G`day ,

    if a phase 2 BA model 84 with the tacho dash , coz you`ve not found it under the bonnet i guess it is ?

    The fuses are under the rectangular cover on the pass side , which is the opposite place to where the hazard , interior , fog , heater switches are .

    White wire from pump past rear heater branch past ignition amp branch to ignition switch .

    Black wire from pump to capacitor .

    If the pump runs all the time as you say and it uses carbys it should not be able to run on lpg unless something else is amiss because they won`t run both fuels at the same time , it would be usual for an EFI car to have the pump run all the time ?
    It's common to leave an EFI pump running to keep the injectors cool but carby engines have a solenoid valve before the carbies to stop the fuel flow, whether its from a mechanical or electric pump or just gravity from a steep downhill or rapid stop.

    In this case I would simply run a totally new feed to the fuel pump tapped into the connector for the petrol shut-off solenoid with a suitable 5A line fuse. When the petrol is switched on the pump comes on. Simple.

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