jumped into Kombi all ignition lights on.

Discussion in 'Fuel System & Electrics' started by peter drogi, Oct 9, 2017.

  1. Alpal

    Alpal Moderator Staff Member

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    SO why was the 'pump rattling'?
     
  2. peter drogi

    peter drogi Member

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    61
    Location:
    bass hill
    Ignition on somehow. Key was in off position in the ignition switch. Yet all lights on in the dash. Power was getting to coil. In turn power to fuel shut off and electric pump.
     
  3. Alpal

    Alpal Moderator Staff Member

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  4. KahunaKombi

    KahunaKombi Super Moderator Staff Member

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    Those were the days :eek::confused:
     
  5. gazman

    gazman Well-Known Member

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    'Were'? still are, I drive a T3 lol
     
  6. Burnstar

    Burnstar Member

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    Artarmon
    Where did you get your cut off solenoid from? I think I need to install one.
     
  7. peter drogi

    peter drogi Member

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    61
    Location:
    bass hill
    Bought it off flea bay.
    Australian made.
     
  8. peter drogi

    peter drogi Member

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    61
    Location:
    bass hill
    Yes get a fuel cut off solenoid.and a tachometric relay to get it to open and let petrol flow when starting and shut fuel off when turning car off.
     
  9. Alpal

    Alpal Moderator Staff Member

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    See post #23 above for Just Kampers link for relay.
     
  10. David H

    David H Well-Known Member

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    I'm going to be cheeky;).
    I thought that's what the key did:rolleyes:! If you have no key bypass! Okay if I'm unconscious & can't turn the key off solenoid & tachometric relay has no merit but at that point I actually don't care:D.
    I take it that this relay/solenoid only works when you use the key? That I can't whilst unconscious.
    But I'm okay if you want another level of security;).
    Just think it's another thing to go wrong:p.
    Had 2 Kombi fires. None were related to this stuff.
    Cheers
     
    Last edited: Nov 10, 2017
  11. Grantus

    Grantus Well-Known Member

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    And if you are unconscious, sleeping in the back, after a decent night out, and too inebriated to drive.......believing you are doing the right thing:

    Ensure your keys are NOT in the ignition when the local ranger or police arrive to make “enquiries”. ;)

    Otherwise, you may find yourself deemed to be driving, even though you were far from the drivers seat. :eek:
     
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  12. David H

    David H Well-Known Member

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    Always taught my kids it was about where the keys were & their availability to you not where you were;).
    Cheers
     
  13. Alpal

    Alpal Moderator Staff Member

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    If you have a bingle and the engine stops one thing extra you don't need is fuel pumping everywhere! Tachommetric relay stops the pump when the ignition is on but engine not running. Cheap insurance..
     
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  14. David H

    David H Well-Known Member

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    Hi Alpal,
    I'm no brain surgeon so could you help me understand how that happens. What controls the tachometric relay? How do I get my engine to go initially with ignition on & engine not running if the fuel pump is stopped?
    Electrical is my weakest field:(!
    Cheers
     
    Last edited: Nov 10, 2017
  15. Tangles

    Tangles Well-Known Member

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    Relay is controlled by voltage. It understands three voltage levels:
    0v, or ignition off
    12v, or battery
    14v, or alternator output with engine running.

    These numbers are rounded off for simplicity. In its simplest form, it understands 13v. If above this it runs power to fuel pump. If below, it cuts power to fuel pump. So when disaster strikes and engine turns off, alternator stops spinning so voltage drops from 14 to 12. Relays then cuts power to fuel pump.
    To start up, relay is set up (programmed) to operate for a set time, ie 5sec when power state changes from 0 to 12v. Enough to start and when alternator kicks in 14v, relay powers fuel pump.
     
  16. David H

    David H Well-Known Member

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    2,057
    Location:
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    Ahh........ Thanks Tangles.
    Same for F/I?
    I was struggling with exactly that concept:confused:.
    Might buy one. Going to need another to wire it in tho'!
    Can sleep now;)!:D
    Thanks again.
    Cheers
     
    Last edited: Nov 10, 2017
  17. rstucke

    rstucke Active Member

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    273
    Location:
    Wamberal NSW AUS
    Tachometric relays rely an ignition pulses to remain turned on. if the engine stops (no pulse) the relay drops out.
    One of the leads goes to the negative side of the ignition coil
    Some vehicles have alternators with an extra terminal for tacho pulses which can also be used.
    There are also 3 terminal oil pressure switches and latching relays that can be configured to drop out when oil pressure drops.
    All FI that come standard in vehicles have devices that cut fuel pumps when the engine stops and in some cases if the vehicle tilts more than a certain angle (roll over)
    If you install an electric fuel pump to feed carbies then it would be a disaster waiting to happen without a tachometric relay.
     
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  18. rstucke

    rstucke Active Member

    Messages:
    273
    Location:
    Wamberal NSW AUS
    Last edited: Nov 11, 2017
    oldman likes this.
  19. Alpal

    Alpal Moderator Staff Member

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    7,964
    Location:
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    Well explained above. Comes with simple instructions to install. Clever little device.
     

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