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Thread: Discovery WVO Conversion.

  1. #21
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    advice please

    great thread. great work guys,
    wanting to do a two tank veggie system on a disco 300tdi.

    going to keep both fuels separate until just before the IP so if i have problems with the WVO i can switch back to DINO and change filter or fix things at home.

    so diesel as normal up to 3waysolenoid valve(normally open)> vacuum boost gauge before the IP.

    another 3waysolenoid to control return fuels to correct tanks

    veggie side of things,2nd tank> faucett pump> Heat exchanger> CAV filter> 3waysolenoid value(normally closed, powered to open)> vacuum boost gauge(same one as above)> IP

    so now my questions.
    1. whilst on veggie mode, would i have to return the diesel to the diesel tank, so i dont stuff the mechanical lift pump ? eg. to stop the lift pump building up pressure as it tries to pump into the back of the closed 3 way solenoid valve.
    Would I 'Tee' off the diesel feed line with a solenoid valve before the 3waysolenoid back into the diesel return with another 'Tee'?

    2.when putting the heat exchanger in series with the cabin heater would the cabin heater need to be on? just for curiosity as i'm thinking of going parallel with the cabin heater anyway.

    3. Setsuna can you remember what is the size of the heater hoses? i have looked for hours on the interweb, and the mechanic i have, doesnt have a clue, so thats why i am asking. want to buy the 'Tee's" and hose before i cut the heater hoses.

    4. is the diesel fuel line 6mm?
    thanks in advance

  2. #22
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    I can tell you the Disco TDI heater core flow is always on. Keeping in mind the coolant will (mostly) flow through the path of least resistance, I would be hesitant to put it in parallel in case the resistance of one path is significantly different to the other path. In series you will always get full flow through both.
    - Justin

    '95 Disco 300TDI - sold
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  3. #23
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    3way solenoids will work well, and give you the exact sized fittings for your fuel lines.

    Diesel lift pump - not sure but I replaced mine with a faucett which switches off when running on WVO to stop this pressure build up with nowhere for the fuel to go. T piece to the return would indeed solve this issue, but could cause the IP to pull fuel from the return line if there is a problem with delivery in the future. (ie once fuel filter blocks, fuel would be pulled unfiltered from return line).

    the cabin heater coolant flows all the time. inline is the best way - get the hot coolant from the head, keep the heater, and have heat exchanger!

    I cannot remember the heater line size, 3/4perhaps?, but ill check the spare hoses when I get home.

    The diesel supply and return lines are tiny!! 3mm or so? and they are plastic! get a bigger line and slip it over the top of the plastic. beware of blockages when adapting from bigger to smaller lines (just keep these points in mind if you have fuel problems in the future!)

    Ive got a few more of those WVO Powered and Carbon Neutral fuel vinyl decals if anyone wants one at a reasonable price

  4. #24
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    oh yeah, depending on the thickness of your oil one of those faucett pumps may not be able to cope. I would suggest testing it out before installing it. I have tried with faucett and holley fuel pumps which have not satisfied me. (I have a good oil supply at the moment, but want to be capable of taking the thicker oils in the future if need be)

    I am sourcing some new gear pumps currently (finally replacing the homebrew temporary solution of 24v printer motor and gear pump!). ill keep you informed on how the research goes.

    oh yes, and one more thing about the WVO tanks - Try not to use a steel tank for the WVO. The tanks rust with any moisture in the WVO and creates a nasty red slime that will cause you grief!

  5. #25
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    Quote Originally Posted by Blknight.aus View Post
    Those plastic 6 way valves dont last long and dont like it when you get all the oil heated up.
    Is there a better one to use?
    Hercules: 1986 110 Isuzu 3.9 (4BD1-T)
    Brutus: 1969 109 ExMil 2a FFT (loved and lost)

  6. #26
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    Yes, you can get a metal version of it the problem with the plastic Pollack valve is the oil swells the seals and makes the valve stick. Heating the oil can cause the plastic to distort and then they leak. Internally.

    I started messing around with using facet pumps and a single port dual position changeover valve for the return line. A simple switch would turn on whatever tank I wanted as the supply tank And then I manually selected which tano I wanted to return to.
    This had the advantage that if the wvo tank was a little thick I could blend some diesel into it on the fly.

    Via the modern day equivalent to smoke signals fromsome place other than the cave where my hat hangs.
    Dave

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    For spelling call Rogets, for mechanicing call me.

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  7. #27
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    hey flagg

    all i can show you is the ones i bought, don’t know if they are any good?, but look similar to others i have seen in WVO online shops?
    i guess i be able to tell ya in a year or 2.
    at A$34 delivered i thought i would give them a go.
    WVO SVO solenoid valve DC12 volt 1/2" NPT-in Pneumatic Parts from Industry & Business on Aliexpress.com

  8. #28
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    Quote Originally Posted by setsuna View Post

    Diesel lift pump - not sure but I replaced mine with a faucett which switches off when running on WVO to stop this pressure build up with nowhere for the fuel to go. T piece to the return would indeed solve this issue, but could cause the IP to pull fuel from the return line if there is a problem with delivery in the future. (ie once fuel filter blocks, fuel would be pulled unfiltered from return line).

    I cannot remember the heater line size, 3/4perhaps?, but ill check the spare hoses when I get home.

    Ive got a few more of those WVO Powered and Carbon Neutral fuel vinyl decals if anyone wants one at a reasonable price

    I am sourcing some new gear pumps currently (finally replacing the homebrew temporary solution of 24v printer motor and gear pump!). ill keep you informed on how the research goes
    to stop the sucking from the tank through the return line, i thought to put in a small 1/4" solenoid valve, between the 2 Tees which turns on the same time as the veggie is on.

    any update on the heater line size? i pulled back the hose a bit and measured the outside of the pipes going into the cabin and got a size of approx. 17.5mm or 11/16". so did you use 3/4"(19mm) coolant hose? if so, i am guessing that the hose clamps stopped the leak through the extra 1.5mm gap?

    so how cheap for a sticker? how and where? i guess PM me.

    update on the pump, or is this a long term project? its my understanding to keep the pressure output of the pump under 7 psi otherwise it might stuff the injector pump?
    was looking at buying,
    Facet Universal Electric Fuel Pump 12 Volt 4 6PSI 120LPH Solid State Petrol | eBay
    not good enough? any better suggestions?

  9. #29
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    The Pump I am looking at is located here:
    DefenderTuning :: 12v Gear pump Diesel / Vegetable oil 48 l/h

    it has an adjustable pressure of 5to30psi. The reason I am not using a facet pump is I don’t know how long it will last with the hot oil (I killed 2 stock membrane pumps pumping hot WVO). The faucet test from a few years ago with the thicker oil was barely able to pump it.

    Dirk has come back and given me the following pricing for pump orders:
    1pump shipping to 6076 $13.40.
    2-3pumps 5% discount, free shipping
    4-5pumps 10% discount, free shipping

    Pollak Valves - I have used one of these plastic valves with the same concerns about longevity. All I can say is that this one has lasted all these years without an issue. The valves listed look like a great option and I would use them if there is a next time!

    Coolant lines look to be of two sizes: 5/8 or 19mm and the other looks like its 16mm I used some of the original piping to get the nice contoured shape and then an adapter/joiner.

    $10shipped for the sticker sound okay? I have two different types – “Powered by biodiesel carbon neutral fuel” and “WVO Powered”.
    Attached Images Attached Images

  10. #30
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    Quote Originally Posted by setsuna View Post



    have you got any like the one in the picture? with clear background, white or silver writing, it would look good against Niagara Grey

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