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Thread: Flaky sediment in blended fuel, why???

  1. #1
    Join Date
    Mar 2016

    Unhappy Flaky sediment in blended fuel, why???

    Hey all.
    Twice now recently I have gotten what looks like fatty flakes( crystals perhaps) forming in my fuel tank causing the fuel line pick-up to get blocked and engine to starve of fuel!. So now twice I have had to drop my fuel tank and clean it, painful !!
    I strained the fuel after emptying the tank and there is flakes floating around.

    So here is all the info I can think may be helpful.

    # the inside of the tank had a light cover on fat/slime on the inside wall. And some floating flakes.
    # I have been blending wvo with 20% unleaded for 2 years.
    # I filter to 5 micron
    # I blend outside the van.
    # issues are happening with my newly purchased van a Kia Pregio, same type of van I have successfully been running blend for 2 years.
    # fuel return line is circulating and not returning to the tank.
    # blended fuel gets filtered when filling the tank ( 2nd filtration)
    # I sometimes add Diesel to the mix straight to the tank if I feel the mix is a little thick and the van is struggling a little.
    I really don't know what is going on, as I have been doing well with blending fuel for 2years. Only had the odd blocked fuel filter.

    Hope someone can help.

  2. #2
    Join Date
    Sep 2005

    Re: Flaky sediment in blended fuel, why???

    Can you test the flakes to see if they melt in your fingers?
    If so, the flakes are purely high melting point oils. Has your supplier had any change to what they are cooking in the oil or a change in oil they use?
    With your previous Pregio vans, did you use the same loped return configuration?
    By returning the hot fuel to the tank, you will help melt these flakes, so they can be burned in the engine, especially when the tank is low and on a long run.
    Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

    Current Vehicles in stable:
    2000 Ford Courier Crew Cab 2.5L Turbodiesel on Blended veggie oil.
    '2014 Toyota Prius (on ULP)

    Previous Vehicles:
    '90 Mazda Capella. (2000 - 2003) My first Fatmobile. Converted to fun on veggie oil with a 2 tank setup. Died when supercharger stuck at max boost for weeks. Stretched head bolts.
    '80 Mercedes 300D. 2 tank conversion [Sold]
    '84 Mercedes 300D. 1 tank, no conversion. Replaced engine with rebuilt OM617A turbodiesel engine. Finally had good power. Donor for current Fatmobile coupe. (body parted out and carcass sold for scrap.)
    '99 Mercedes W202 C250 Turbodiesel (my darling Wife's car)[sold]
    '98 Mercedes W202 C250 Turbodiesel (my car)[sold]
    Parts Car C220 1993 SOLD.
    '85 Mercedes Benz W123 300CD Turbodiesel single tank using 95% used cooking oil and 5% to 10% misfuel (where someone had filled diesel vehicle with petrol).
    '06 Musso Sports Crew Cab. Running on used cooking oil with 5% to 10% misfuel. [Head gasket blew!]

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  3. #3
    Join Date
    Mar 2016

    Re: Flaky sediment in blended fuel, why???

    Thanks for your reply, I was thinking I should return the fuel to the tank, I think you are right perhaps just a different oil, I get oil from a few different places and that could be a issue too. The flakes seam soft enough to melt between my fingers. I was just surprised, and was wondering if it was a reaction with the metals in the new van, or a reaction of some sort or algie as I haven't seen it before. I was running the same loop in the old van.


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