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  1. #31
    Do you ever leave? Mickss355's Avatar
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    Quote Originally Posted by Smitty2 View Post
    guys.. am i missing something here?

    Davo's original post -
    Hi guys I was reading the Vic roads regulations on modifications as I'm currently putting in new fuel lines.

    What I read regarding the installation of an electric fuel pump was interesting. And it seems I need to redo the way the pump gets its 12V+

    The guidlines say that the pump must turn off if the engine stops. Now my pump runs off a relay which gets it power from the on position of the ignition system.
    So my pump will turn off and on with the ignition.
    But say the car was in an accident and the key was still in the On position but the engine was stopped, the pump would still
    be working.

    --------------------------

    ...from all all the stuff recently posted, I cant see how/where the pump is actually turned off??
    The safety switch that we're all talking about/using needs to see an ignition pulse to stay energised - if the engine stops there is no ignition pulse so the safety switch breaks the contact to the fuel pump relay/s and the fuel pump is turned off - i would have though that was pretty obvious !
    He who dies with the most toys wins !

  2. #32
    Do you ever leave? CNCDAVO's Avatar
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    Smitty the LPG switch needs two inputs to work. One input is 12V coming from the ignition ON position. The other input is a pulse from either the - side of the coil or in my case the tacho wire out of the ignition box.

    So for the saftey switch to supply power to the fuel pump relay it MUST have both inputs.

    So if the ignition is ON but engine is not turning over no power to the fuel pump relay.

  3. #33
    Part of the furniture phtwgn's Avatar
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    Spose you could also set this up on a pre determined pressure switch h on your oil/ignition so you ignition will start for a time then if no oil pressure it will cancell ignition spark! Or if your oil presssure dropped below say 20 psi on a good engine = ignition cut ?

    Would this be feassable?

  4. #34
    Brock fanatic adp calais's Avatar
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    The idea is to turn off the fuel pump so if there is an accident and a fuel line is cut it doesn't spray fuel everywhere. Cutting the ignition serves no purpose.
    HDT Brock Calais

  5. #35
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    Excellent info , nice to see this will work from the MSD as well

  6. #36
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    Quote Originally Posted by Mickss355 View Post
    I just used the tach wire from the msd - your crane ignition should also have a tach wire.

    The safety relay is designed to activate from an ignition pulse so becuase both the crane and msd fire the coil with 400 to 500 volts you cant hook up your tacho or the safety switch to the coil anymore so a tach wire is provided for this purpose !
    I had a tachmetric relay set up on mine until I put the 6al-2 on. Msd say the tach wire wouldn't fire the relay so I never tried!!
    I'll wire it back in now and give it a go. Cheers

  7. #37
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    Quote Originally Posted by SICKHG View Post
    I had a tachmetric relay set up on mine until I put the 6al-2 on. Msd say the tach wire wouldn't fire the relay so I never tried!!
    I'll wire it back in now and give it a go. Cheers
    Mate would love to see the results. I have to do this myself.
    Another way that was posted here some time ago was a changeover relay along with an Autometer pro-lite sender, so if the oil light is on or pressure drops the pump cuts out and viceversa.

  8. #38
    casual poster SICKHG's Avatar
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    Quote Originally Posted by Gregaust View Post
    Mate would love to see the results. I have to do this myself.
    Another way that was posted here some time ago was a changeover relay along with an Autometer pro-lite sender, so if the oil light is on or pressure drops the pump cuts out and viceversa.
    Well it does work Gregaust. I've split the grey tach wire from the msd, 1 to the tacho the other to the tachometric relay and it fires and runs perfectly.

    Cheers Mickss355!!

  9. #39
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    What brand relay works with MSD ? I've seen Peel CP30 as in the links, Gastec is another.

  10. #40
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    Quote Originally Posted by Gregaust View Post
    What brand relay works with MSD ? I've seen Peel CP30 as in the links, Gastec is another.
    I will try and find out what my auto sparky uses when I get mine wired up in a couple of weeks.

  11. #41
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    Thanks

  12. #42
    casual poster marras's Avatar
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    Quote Originally Posted by Gregaust View Post
    What brand relay works with MSD ? I've seen Peel CP30 as in the links, Gastec is another.
    The sparky that I used said a gas relay that works off the oil pressure he would use to shut the fuel pump off.
    He said that he doesn't use a relay through the MSD.

  13. #43
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    Ok thanks mate.. I want to go the electronic way without the extra sender. Already got 2 senders , original and 1 or a prolite .

    What LPG unit is the go, Peel ? Gastec?

  14. #44
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    Ok a little update . I went with the Gastec unit as attached . Trialled one and worked sweet with MSD 6AL that was triggered through the white wire .

    Today fitted another with MSD-6AL but this tme triggered with the magnetic trigger , no go unfortunately , wants to keep switching on the LPG relay. BUT if the magnetic trigger is unplugged at the dissy then works ok. Some how the magnetic trigger must be putting a signal at the tach output .
    Now on the LPG relay it says the centre terminal to connect to coil or HT lead. Obviously coil is out but what about the HT lead ? Sure I saw somewhere a ire wrapped around the HT lead might give a signal ??

    EDIT , see on page 2 NeRok did the coil wire trick. Maybe worth a try ??
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    Last edited by Gregaust; 25-01-2014 at 11:34 PM.

  15. #45
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    Hmmm ,well wire round the coil lead is a no go as well . Gets a signal ok but after cranking must be some residual current in the HT lead that keeps putting power to the LPG switch. It tries to shut off but can't ..

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