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  1. #1
    Do you ever leave? CNCDAVO's Avatar
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    Question Electric Fuel pump power supply

    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.

    My question is how can I wire the relay so it gets 12V+ and the supply be cut if the engine stops.

    Maybe I could use the 12V+ off the coil? But then the pump would not be on until the engine was running.

    If you have an answer can you please explain how I can do it in simple terms and clear instructions so I can do it.

    Cheers Dave

  2. #2
    Brock fanatic adp calais's Avatar
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    HDT Brock Calais

  3. #3
    been here .......too long Smitty2's Avatar
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    Davo ...fit an oil presssure safety switch and route the wiring thru that.
    If the engine stops, oil pressure is zero and the safety switch cuts off the power.

    thats the way i have done it on the race car car ...

    ps Holley (and others ) make a safety switch for this very purpose.
    Holley 12-810 Oil Pressure Safety Switch 5 psi Minimum 1/8 in. NPT | eBay
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  4. #4
    Do you ever leave? CNCDAVO's Avatar
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    Please excuse my ignorants, but I have an oil pressure unit for the oil pressure gauge.

    http://www.holley.com/12-810.asp
    It says to mount the above unit on a T- piece. So you have the safety switch and your pressure gauge. I don't think I could fit both a saftey switch and the pressure gauge sender on my set-up.



    So how do you wire it in?
    http://www.holley.com/data/Products/...R9680-1rev.pdf

    No Relay needed anymore???
    Last edited by CNCDAVO; 14-01-2013 at 04:01 PM.

  5. #5
    sle owner vhg304's Avatar
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    Use a tachometric relay.
    vh sle
    vk group 3

  6. #6
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by CNCDAVO View Post
    Please excuse my ignorants, but I have an oil pressure unit for the oil pressure gauge.

    Holley Performance Products Fuel Pump Safety Pressure Switch*12-810
    It says to mount the above unit on a T- piece. So you have the safety switch and your pressure gauge. I don't think I could fit both a saftey switch and the pressure gauge sender on my set-up.
    ...............
    Davo...I use a sandwich plate on the pump, not a T setup as I have no space either

    I have wired it per the Holley instructions but still use a relay for the pump


    hth
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  7. #7
    Do you ever leave? CNCDAVO's Avatar
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    Smity can you please show me a pic of your sandwich plate setup?
    Just when I thought I was nearly there too.

    Smitty where in the Holley wiring diagram is your relay placed?

    Thanks Dave
    Last edited by CNCDAVO; 14-01-2013 at 04:47 PM.

  8. #8
    been here .......too long Smitty2's Avatar
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    Dave

    don't have pic of the setup (true!)
    will get one and post it up

    about the relay...its gets the lead/wiring from terminal C (ie.. power from the safety switch- ignition on and engine running so has oil pressure)
    and then from the relay that goes off to the pump . Basically the same way you would wire up the relay...without the safety switch in the middle
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  9. #9
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by CNCDAVO View Post
    Smity can you please show me a pic of your sandwich plate setup?
    Just when I thought I was nearly there too.
    ........
    first pic is on car..taken from in front of LH wheel (but sway bar is in the way)



    you can also see an oil temp sender on the sandwich plate (RH side)

    2nd pic is on the bench..much clearer




    hth
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  10. #10
    Part of the furniture HJPrem75's Avatar
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    Dave, if you are still going to wire up a relay for the fuel pump the wiring would be something like this


  11. #11
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by HJPrem75 View Post
    Dave, if you are still going to wire up a relay for the fuel pump the wiring would be something like this

    you put a pic to my wordy explanation..very clear!
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  12. #12
    Do you ever leave? CNCDAVO's Avatar
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    Thank you very much HJPrem75 for the pic, thats what I need to follow wiring. LOL

    Thanks to everyone else too for there great help.

    Cheers Dave

  13. #13
    Do you ever leave? CNCDAVO's Avatar
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    I think one of these LPG saftey switches (tachometric relay) would be an easier set-up.

    What you think?

  14. #14
    Part of the furniture HJPrem75's Avatar
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    Quote Originally Posted by CNCDAVO View Post
    I think one of these LPG saftey switches (tachometric relay) would be an easier set-up.

    What you think?
    The wiring will be about the same, however the tachometric relay can be installed anywhere you can fit it. Not sure if there is a preference between pressure switch or tachometric relay...they both should accomplish the same thing.

  15. #15
    Do you ever leave? CNCDAVO's Avatar
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    The tachometric option seems less hasle and the cheaper option. Not that I'm looking for a cheaper option, but like you say I could us a tachometric relay next to the fuel pump relay.

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