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Thread: Gunge in fuel tank

  1. #1
    Join Date
    Dec 2007
    Location
    South Australia
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    1,142

    Gunge in fuel tank

    No not a clagged up veg oil tank, the diesel tank. 2 weeks ago I lost power during a trip. Each time I stopped I had less power and less revs until I finally had a maximum 1800rpm and top speed of 60ks (on the flat)
    After a tow and limping home I checked my filters and found the diesel filter was still flowing but very dirty. On cutting it open I found this
    http://farm4.static.flickr.com/3168/...7fe1218179.jpg
    Gunge! but only in the diesel filter, the vege filter was pristine after 6000km. However after replacing the filter I had no improvement and my vacuum gauge still told me all filters were OK. So it was off with the IP.
    The IP was not spotless but not bad and the filter screen in the high pressure head was clear. I decided to change all my O ring seals for Viton ones as the one at the bottom of the pressure regulating valve was fairly shot. After waiting days for the new seals I finally got it all back to together to find no improvement in power whatsoever.
    Johnnojack

  2. #2
    Join Date
    Dec 2005
    Location
    Perth Western Australia
    Posts
    931

    Re: Gunge in fuel tank

    eeeeuuu, yucky.

    Has someone dropped a dog turd in your tank?

    I'd be checking for vege returning to diesel tank. Is your diesel tank a plain steel tank? If so, or even not so, it might be worth replacing with plastic or coating with POR 15. The degreaser that comes with the POR 15 kit moves all sorts of gunge and even it you don't coat it, it'll need to be cleaned out

    'Tis a good thing you have the competence to pull your IP apart and check/clean/replace despite it not perhaps being necessary. Also a good thing your filters have pulled this stuff out.

    All the best with it.

    Tim
    Toyota Landcruiser 1988 HJ61 Manual Wagon
    12H-T turbo Direct Injection.
    Twin Tank setup runs on 100% WVO after warm up. 30 plate FPHE with 80C output, 12mm fuel lines
    Start up and shut down electric fuel pump feeds IP direct.
    Front 4WDSytstems Lokka, Rear ARB airlokka for quick escapes up sandhills. Performance GTurbo with 600mm FMIC gives 450nm @ 1700rpm at 20psi boost.

  3. #3
    Join Date
    Dec 2007
    Location
    South Australia
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    Re: Gunge in fuel tank

    Continuing. While dismayed at the lack of improvement I knew I had to chech out my diesel tank. Got it off and found the inside resembled a scene from Red Dwarf see pic
    http://farm4.static.flickr.com/3283/...2ee89635a0.jpg

    Yes it is a steel tank and the vertical lines which look like rusty jetty pylons are the steel fuel in and out pipes. I took a deep breath and cleaned it with a cupful of caustic soda mixed in 2 litres of water. Put tank in wheelbarrow and rocked it for a good while then rinsed it out and blasted it with pressure washer. Came up a treat. This is what came out.
    http://farm4.static.flickr.com/3163/...aeb57fe84a.jpg

    Johnnojack

  4. #4
    Join Date
    Nov 2007
    Location
    South Coast, NSW
    Posts
    870

    Re: Gunge in fuel tank

    so dog turds in filter and half of the simpson deserts dust in the tank. you'll be busy for a while now. goodluck mate it always sucks when the truck is outta action.
    Cheers Mate
    Cheers
    Nick.
    Harold 2002 Toyota Landcruiser 105 series. 4.2lt turbo glide turbo, Too lazy to make bio nowdays times money. 3'' lift.

    Roidio 2001 Holden Rodeo 4x4 2.8L TD. 2.5" exhaust sytem, H/E shower system. 4" Lift, Airbags, And lots of fruit, B100 for 55,000 . SOLD

    Elsa 1983 Mercedes-Benz W123 300D. Still The Fastest Merc in Oz, Self built and Female proofed. COUSINS NOW

  5. #5
    Join Date
    Dec 2007
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    South Australia
    Posts
    1,142

    Re: Gunge in fuel tank

    More, After many hours on the computer I found this, thanks to VW fans. VWDieselParts.com :: View topic - internal injection pump pressure

    At the bottom of page 3 is a description below the photo of how to adjust the internal pressure regulating valve. So after manufacturing my 6th specialist tool I removed the valve and gingerly tapped at it, after a few much harder whacks I moved it down about 2mm . On replacing it I started her up again and all my horses are back, 4000rpm in an instant. What I have done is raise the internal fuel pump pressure. Trouble is I don't know just how much so may get a new valve to get it back to factory pressure, or work out a way to measure the pressure. (described in detail in the VW link). Ironic isn't it? delicate precise Injection Pump machined to very fine tolerances, adjusted with....a HAMMER
    Johnnojack

  6. #6
    Join Date
    Sep 2006
    Location
    Sydney
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    863

    Re: Gunge in fuel tank

    Johnnojack,

    Is the tank in the pics originally installed in the vehicle when you bought it or is it something you have added to the vehicle?

    Have you done anything different lately? using different oil? using unknown oil? or filling up with dirty diesel?
    Fitian
    <><

  7. #7
    Join Date
    Dec 2007
    Location
    South Australia
    Posts
    1,142

    Re: Gunge in fuel tank

    Quote Originally Posted by RODEONICK View Post
    so dog turds in filter and half of the simpson deserts dust in the tank. you'll be busy for a while now. goodluck mate it always sucks when the truck is outta action.
    Cheers Mate
    Yeah thanks Nick. I think from reading previous post on this the gunk was dead Algae, (the soft light brown stuff in the filter) however the harder dark brown plasticy stuff seemed like dried up vege oil. This was mostly on the steel bits above the fuel level in the tank. (and those crusty fuel pipes)
    Re vege oil in fuel tank it isn't supposed to happen with my manual delay switching, but I know it has happened. Won't be happening anymore with my new looped diesel system.
    Johnnojack

  8. #8
    Join Date
    Dec 2007
    Location
    Sydney
    Posts
    44

    Re: Gunge in fuel tank

    WOW. That's quite gross! Glad you shared photo's so I could see what you meant!

    Good luck with it all

    Vi

  9. #9
    Join Date
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    Location
    South Australia
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    Re: Gunge in fuel tank

    Quote Originally Posted by Fitian View Post
    Johnnojack,

    Is the tank in the pics originally installed in the vehicle when you bought it or is it something you have added to the vehicle?

    Have you done anything different lately? using different oil? using unknown oil? or filling up with dirty diesel?
    Yes original equipment steel tank only used for diesel. 2nd aluminium tank for veg.
    Same oil mostly Soy based (would like to find a supply of Canola)
    Dirty diesel possibly, not knowingly, certainly nothing like the state of the tank would suggest. Thats why I suspect algae. (With 230,000km I guess there could have been a gradual build up)
    I'll be adding an algicide to my diesel from now on.
    Johnnojack
    Last edited by Johnnojack; 6th April 2008 at 09:51 PM.

  10. #10
    Join Date
    Sep 2006
    Location
    Sydney
    Posts
    863

    Re: Gunge in fuel tank

    Quote Originally Posted by Johnnojack View Post
    (With 230,000km I guess there could have been a gradual build up)
    I'll be adding an algicide to my diesel from now on.
    Johnnojack
    While you do that, would you like to install a cheap in line filter on the return line going to that tank?

    Good luck
    Fitian
    <><

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