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Thread: do i need a 6v or 12v fuel pump?

  1. 17th March 2014, 04:14 PM #1
    LoveB
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    do i need a 6v or 12v fuel pump?

    question time, I've plugged my 12v fuel pump (which was on the vehicle when it ran in october) directly to the battery to see if that made a difference but it appears its not sucking enough fuel up the line to get the car running again? it did before but when I revved it it would miss....

    ive got a 12v pump and someone told me to use a 6v as it takes less power to get it going? (is the S1 even 12v?) I'm gonna get a fuel pump tomorrow but i just need to know what kind..
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  2. 17th March 2014, 04:30 PM #2
    Aaron IIA
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    Series I Land Rovers are 12 volt positive earth. If it has had an alternator fitted, it will most likely now be negative earth.
    Aaron.
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  3. 17th March 2014, 04:32 PM #3
    Aaron IIA
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    Are you still using the original SU fuel pump? Have you cleaned the valves and set the points?
    Aaron.
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  4. 17th March 2014, 04:37 PM #4
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    Blknight.aus
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    which 12v pump are you using if its one of the original ones if you dont set them up just right they are a slug..

    count the cells on your battery if you have 6 cells you need a 12v pump. any facet pump will do but if you want to maintain the OEM one it will need servicing.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

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  5. 17th March 2014, 05:16 PM #5
    LoveB
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    Still original (well replica, its branded harting)

    it was last working in november. had the same issue prior but it managed to suck fuel up and get it running then. it was opened up and cleaned and put back together. now it doesnt seem to suck eonugh up. Maybe the glass? I need to check the hoses tomorrow. I put more fuel in the tank to make sure there was fuel to suck up anyway. and I'll give it another shot.

    still positive earth on this one. I've still got the original generator on it. i tried another aftermarket fuel pump (which was much much younger) and that didnt even work at all! lol
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  6. 17th March 2014, 06:04 PM #6
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    Blknight.aus
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    some of the newer facet style pumps are solid state and wont work on positive earth.

    the ones with 2 wires coming out of the electrical grommet dont care which side is earth as the body is electrically isolated

    the early pumps didnt care which way the voltage was applied but some had a diode in them or a capacitor which was ment to arrest voltage spikes when the pump was "returning" after completing a stroke, the diode version got hot until the diode blew out and would then work IF the winding hadnt given out first.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.
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  7. 17th March 2014, 06:20 PM #7
    LoveB
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    i might just try and plug it to the battery again tomorrow and see if i leave it for 30 secs or so if it would suck up enough petrol. hope so. its just easier to move it around when its running. i need the carby rebushed as its got a bit of a leak coming from the shaft. lol
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  8. 17th March 2014, 06:23 PM #8
    LoveB
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    ive got two pumps branded harting as per my s1 thread. im really keen to get it going so once i can move it around the workshop i can then work on the brakes and what not. but the other pump doesnt go at all. if all else fails i will pickup a cheap 12v pump from supercrap tomorrow and plug it straight into the battery for when i need to start it
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  9. 17th March 2014, 06:34 PM #9
    Blknight.aus's Avatar
    Blknight.aus
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    or just get a small fuel can, braze a barb onto it and set yourself up for a gravity feed fuel system.
    you can also do the same with a boat fuel tank or the fuel tank off of a lawn mower.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.
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  10. 18th March 2014, 07:45 AM #10
    Hartley
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    Modern pumps often deliver with too much pressure and push past the float valve and cause flooding
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