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Thread: Seals and hoses

  1. #1
    Join Date
    May 2006
    Location
    traralgon vic
    Posts
    19

    Seals and hoses

    Hi all ,
    I am just about to start running my vehicle on biodeisel from w.v.o.
    I have a "94" Toyota Hiace 2.8. litre van does anyone recommend to change any of the seals and hoses for long term biodeisel use?

    Cheers!

  2. #2
    Join Date
    May 2006
    Location
    traralgon vic
    Posts
    19

    Re: Seals and hoses

    Hi agian.
    I just read RossH's thread on hoses I spose that kinda answers my question.
    but Will my "94" Hiace van have the synthetic seals and hoses?
    Last edited by intuo; 19th May 2006 at 10:35 PM.

  3. #3
    Join Date
    Oct 2005
    Posts
    524

    Re: Seals and hoses

    I ran an '84' Hiace for years on biodiesel without problems. The hose/seal thing is overrated. Just use the biodiesel and then if a problem occurs, worry about it then.

  4. #4
    Join Date
    Sep 2005
    Location
    Newtown
    Posts
    27

    Re: Seals and hoses

    My neighbour is looking to buy a 91 Toyota Hiace diesel and asked me if it could run on bio (like I do my 95 Hilux). I told her that some of the hoses and seals might need to be changed. I want to give her some harder facts so here are the questions -

    Roughly how much would it cost to have a mechanic replace the IP seals up front? (Sydney inner west)

    If she just waits for the seals to degrade and then replaces them, do they fail slowly or suddenly and are there damaging side effects of failure?

    Assuming it has original seals, roughly how long would they be expected to last before needing replacement?

  5. #5
    Join Date
    Jan 2006
    Location
    In the sunshine state.
    Posts
    860

    Re: Seals and hoses

    Seals will fail gradually ending in a drip leak then it will start to go worse. Fuel lines need nitrile rubber at least, synthetic is a must.

    Injector pump seals MUST be viton so it should cost around $500 to have it resealed but be warned older pumps need overhailing and this may cost upwards of $1K

    So BOSCH VITON seals, some nylon, viton fuel lines and away you go.

    Oh fit a CAV adapter or replace with a cav fuel filter, then plenty of cheaper CAV filters too as the OEM is far to expensive and the gunk in the tank will be plenty too! CV filter can be bought for as low as $5 each oin box of 20, or a bit more for low counts. OEM fuel filter is likely to be $30 or more. Be aware you loose the water sensor with a cav conversion.

    Matt
    Biodiesel Bandit

    Landcruiser '98 80 series B100.

  6. #6
    Join Date
    May 2008
    Location
    Kilcoy queensland
    Posts
    15

    Re: Seals and hoses

    i was thinking of using fuel injection hose like below it uses the same Fluoroelastomer as Viton hose any suggestions
    from http://beltpower.com/pdfs/WH411k_Low_Pressure_Hose.pdf

    H077 Fuel Injection Hose
    SAE 30R9
    Typical Application: Designed specifically for electronic
    fuel injection systems
    Inner Tube: Fluoroelastomer Veneer
    Reinforcement: Multi-Fiber Braids
    Cover: ECO (Epichlorohydrin Copolymer)
    Temp. Range: -30F to +275F (-34C to +135C)
    Catalog Hose Hose Working Min. Burst Min. Bend Inch. Merc. Wt. Per Avail. Hose
    Number I.D. O.D. Press. (PSI) Press. (PSI) Radius Vac. ("Hg) 100 Ft. Lengths End
    H07704-10 1/4 1/2 125 900 3 24 11 10' E.F.I.
    Clamps
    Page 83
    H07705-10 5/16 9/16 125 900 3-3/4 24 13 10'
    H07706-10 3/8 5/8 125 900 4-1/2 24 16 10'

  7. #7
    Join Date
    Jan 2006
    Location
    In the sunshine state.
    Posts
    860

    Re: Seals and hoses

    Should be good if its a fluoroelastomer, pity they don't sell a 1/2 inch variant. That would save me having to buy full viton.

    Matt
    Biodiesel Bandit

    Landcruiser '98 80 series B100.

  8. #8
    Join Date
    Oct 2008
    Location
    Brisbane
    Posts
    13

    Re: Seals and hoses

    This page says *all* low sulphur diesels and not just biodiesel can cause seal problems - under subheading "Impact on Seals in Fuel Pumps":

    AUSTRALIAN REFINERIES

  9. #9
    Join Date
    May 2008
    Location
    brisbane
    Posts
    14

    Re: Seals and hoses

    Father in law had his surf fail last week. The report from the mechanic was do not use bio. The injector pump failed and the cost will be $4200. The surf is a 1994 model import from Japan. Suspect seals ? Mechanic does not want to give to much away.

  10. #10
    Join Date
    Jan 2006
    Location
    In the sunshine state.
    Posts
    860

    Re: Seals and hoses

    Mech may be trusted but , as long as the bio is well made there are no issues apart from material compatibility. Pumps wear and seals degrade, time can do much of this, $4200 is extortion, a pump rebuild should cost around $1000 including some parts (they like to replace worn parts so they can charge heavily) and new seals. Insist on BOSCH viton seals not Toyota.

    This is entirely dependant on the IP on a 94 surf being a Bosch VE variant, if its not then this may explain costs.

    Call Rocklea Diesel or Brisbane Diesel at Springwood. The latter is good for this sort of work by my experience. Note that they will bag bio but are reliable and know the issues.

    Matt
    Biodiesel Bandit

    Landcruiser '98 80 series B100.

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