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Thread: Twin tanking and pumps

  1. #1
    Join Date
    Apr 2016
    Location
    Melbourne
    Posts
    11

    Twin tanking and pumps

    Going to twin tank my 300TDI, these engines use a mechanical lift pump before the injector pump and I'm going to replace this with an electric pump (mechanical ones are prone to failure).
    I plan to have two Facet posiflow pumps, one for veg the other for diesel. Just wondering if it is best to switch the pumps on and off when changing over fro veg to oil and vice versa. I should be able to wire them to power with the change over valves or is there no harm in leaving them running but not been able to flow when the valve is shut.

    Thanks
    Bruce

  2. #2
    Join Date
    Dec 2007
    Location
    South Australia
    Posts
    1,215

    Re: Twin tanking and pumps

    Why not just turn the pumps on or off and dispense with the changeover valves? Of course you'll still need valves on the rerurn side (single action ones). Are these pumps something special as I would have thought a mechanical pump would be better than a facet.
    Johnnojack
    4WD Isuzu Jackaroo 3.1 190000km on WVO,(2019) 2 tank home built system 6 solenoids heated filter, fuel line and tank pickup for thicker oil. Mk. 9 version now and no changes planned
    Mercedes W201 190D 1986 model: no fuel mods except bigger fuel line from tank, running blend of 90% oil 10% petrol 11000km to date. Motor purrs but car has electrical gremlins

  3. #3
    Join Date
    Apr 2016
    Location
    Melbourne
    Posts
    11

    Re: Twin tanking and pumps

    That's a good idea, hadn't thought of that. The mechanical pump on my 300tdi just died and it is a popular upgrade to go electric, the pumps are known weak point on these engines.

    Cheers!

  4. #4
    Join Date
    Sep 2009
    Location
    Brisbane (North Side)
    Posts
    801

    Re: Twin tanking and pumps

    Just make sure the pumps have non return valves in them. The cheaper facets will allow flow back.
    Regards,

    Cade.

    2006 Landcruiser HDJ100 (1HD-FTE) 20,000 on bio
    2006 Ford Courier(WLT Motor), 10,000 on bio
    2002 Landcruiser HZJ105r (1HZ motor) 250,000 on bio (sold)
    2006 Mazda B2500 (WLT motor) 80,000 on bio (sold)



  5. #5
    Join Date
    Apr 2016
    Location
    Melbourne
    Posts
    11

    Re: Twin tanking and pumps

    Yeah good pick up, appreciate the help.

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