Working with petrol tanks ..

Discussion in 'UK Motorcycles' started by T i m, Feb 29, 2008.

  1. T i m

    T i m Guest

    Hi All,

    I've got the tank off my CB Two Fifty ready to de-rust the underside
    and where the saddle has been rubbing and prep the rest for a quick
    re-spray.

    After draining it completely and leaving it to air a couple of days I
    note it's still fumey and wondered if that was still a risk (maybe
    even more a risk of explosion than when it's full of petrol?) and what
    the std practice is re washing it out (or whatever) in these
    circumstances please?

    I did think of inflating a big balloon in there while I'm working on
    it, therefore effectively removing most of the air and sealing the
    holes etc?

    All the best ..

    T i m
     
    T i m, Feb 29, 2008
    #1
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  2. T i m

    Krusty Guest

    Filling it from a car exhaust is the usual method, but throwing it into
    a bonfire is far more fun, & has the added benefit of removing all the
    old paint[1].

    [1] Along with your eyebrows if you're not careful.

    --
    Krusty
    www.MuddyStuff.co.uk
    Off-Road Classifieds

    '02 MV Senna '03 Tiger 955i '96 Tiger '79 Fantic Hiro 250
     
    Krusty, Feb 29, 2008
    #2
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  3. T i m

    Pete Fisher Guest

    I am experimenting with the cheap cola (only needs 5 litres to be brim
    full) method at the moment on a tank that hasn't been used in anger for
    17 years. As it last held two-stroke premix it is amazingly leak free.
    More a question of cleaning out the residue of the Bardahl. A bit of
    rust visible too, but not really bad. I am hoping that just a good clean
    out and an in-line filter will suffice.
    Are you going to weld, braze or otherwise assault it with flames or
    sparks then?


    --
    +----------------------------------------------------------------+
    | Pete Fisher at Home: |
    | Voxan Roadster Gilera Nordwest * 2 Yamaha WR250Z |
    | Gilera GFR * 2 Moto Morini 2C/375 Morini 350 "Forgotten Error" |
    +----------------------------------------------------------------+
     
    Pete Fisher, Feb 29, 2008
    #3
  4. T i m

    T i m Guest

    Well, sparks possibly, from either a wire brush or mini air powered
    disk sander? Enough of a possibility of seeing sparks to make me feel
    uncomfortable doing so.

    I can plug / masking tape over the outlet stub (I'd do that to prevent
    painting the threads in any case) and I guess I could pack the filler
    neck with rag then also seal it with masking tape?

    All the best ..

    T i m
     
    T i m, Feb 29, 2008
    #4
  5. T i m

    Derek Turner Guest

    When I were a lad rinsing with paraffin was standard practice to remove
    petrol. Has a much higher flashpoint and a little residue of it in the
    petrol for the first tankful won't hurt. Can you still buy paraffin by
    the gallon at garages?
     
    Derek Turner, Feb 29, 2008
    #5
  6. T i m

    darsy Guest

    puff.

    just lob a lit match into it, and see what happens.
     
    darsy, Feb 29, 2008
    #6
  7. T i m

    Dan L Guest

    Live dangerously man, we've recently been dremelling around the back of
    a VFR400 tank that's full of petrol.

    Nothing wrong with a bit of danger, biker boy.



    --
    Dan L

    Too much time to think, too little to do.


    http://thebikeshed.spaces.live.com/
    1996 Kawasaki ZR1100 Zephyr

    BOTAFOT #140 (KotL 2005/6/7)
    X-FOT#000
    DIAABTCOD #26
    BOMB#18 (slow)
    OMF#11
     
    Dan L, Feb 29, 2008
    #7
  8. T i m

    T i m Guest

    Does this displace the combustible fumes with non-combustible ones
    (for a while anyway)?
    ;-)

    All the best ..

    T i m
     
    T i m, Feb 29, 2008
    #8
  9. T i m

    T i m Guest

    I made some explosives when I was a lad so I know what happens thanks
    ... ;-)

    All the best ..

    T i m
     
    T i m, Feb 29, 2008
    #9
  10. T i m

    David Toft Guest

    Many years ago, when I worked for a company making fuel tanks, the
    recommended method of cleaning prior to repair was to :-
    Steam clean for 10 minutes
    Flush with running water for 20 minutes
    Steam clean for 10 minutes
    Flush with running water for 20 minutes
    Steam clean for 10 minutes
    Flush with running water for 20 minutes
    (3 cycles in all)
     
    David Toft, Feb 29, 2008
    #10
  11. T i m

    T i m Guest

    As I said, I might actually be more comfortable working with it full
    of petrol .. but no I'm not going to.
    Erm, well, 'boy' .. I wish .. 'biker' erm not sure I've ever been one
    of them even when I was a boy! ;-)

    Old boy who has always had a bike might be nearer the truth.

    Risk taker or someone who likes living on the edge, you decide ...

    P50, NSU Quickly, SX150, CG125, XT350, 350 Bullet, CB250, R100RT and
    about to take our daughter round to her boyfriends in the Rover 218SD
    (because it's blowing a gale, freezing cold and pissing down with rain
    out there).

    Ride safe .. ;-)

    T i m



    ..
     
    T i m, Feb 29, 2008
    #11
  12. T i m

    Dan L Guest

    You should google the phrase, or ask BGN ;-)
    Heh, you sound like me, 'cept more bikes and I've got a Volvo.
    I generally try to.


    --
    Dan L

    Too much time to think, too little to do.


    http://thebikeshed.spaces.live.com/
    1996 Kawasaki ZR1100 Zephyr

    BOTAFOT #140 (KotL 2005/6/7)
    X-FOT#000
    DIAABTCOD #26
    BOMB#18 (slow)
    OMF#11
     
    Dan L, Feb 29, 2008
    #12
  13. T i m

    crn Guest

    In that case just fill it with water while you are working.
    Then remove the bottom tap and the cap and leave it on top of a radiator
    for a few days to dry out. Once dry add about a mugfull of small gravel
    and shake until your arms hurt to dislodge any rust. Shake out the debris,
    blow out dust with an airline and treat with your tank sealant of choice.
     
    crn, Feb 29, 2008
    #13
  14. T i m

    Eddie Guest

    I doubt it, but you can buy it from most garden centres.
     
    Eddie, Feb 29, 2008
    #14
  15. T i m

    Simon Wilson Guest

    T i m wrote:

    You missed out a MSOHP
     
    Simon Wilson, Feb 29, 2008
    #15
  16. What he said. Exhaust pipe into the filler hole, run the car for 10-15
    minutes, job done. Some people like to lob a lighted match at the
    filler hole afterwards. Assuming the tank was dry before you started
    purging it with car exhaust, the worst you'll get is a tiny little
    'pop'. Yes, really.

    Of course, if you tried purging it with liquid still in it the results
    will be more spectacular.
     
    [email protected], Feb 29, 2008
    #16
  17. T i m

    Beav Guest

    I daren't tell you what WUN's tank went through when it reached me. A
    thorough stripping back to 100% bare metal and then it was attacked with a
    drill mounted wire wheel, a stand dril mounted wire wheel so I could REALLY
    get some weight behind it and a gradual diminishing set of D/A discs going
    from 80 grit to 320. I forgot to ask WUN if he'd done anything about the
    fmes, so I just plugged the filler hole with a plastic bottle wrapped in
    masking tape.

    It didn't appear to blow up and it's currently looking pretty "Norton-ish"
    again.

    Just shove an exhaust extension into the filler hole of the tank and leave
    the engine running for 15 minutes. After that, you're pretty safe.


    --
    Beav

    VN 750
    Zed 1000
    OMF# 19
     
    Beav, Feb 29, 2008
    #17
  18. T i m

    Beav Guest

    Better if it's full to the brim than if it's almost empty.

    Way back in the days when it was acceptable to wash car parts in petrol, we
    had any number of trays full of petrol laying around the garage and they
    were always the first place anyone threw a fag end. I've never seen one go
    up, but I have seen a number of head injuries when the person closest to the
    tray *thought* it might and instinctively made a bid for safety. Stupid
    fuckers NEVER learned. Petrol doesn't burn very well on its own, but the
    fumes are frighteningly combustible.


    --
    Beav

    VN 750
    Zed 1000
    OMF# 19
     
    Beav, Feb 29, 2008
    #18
  19. T i m

    Beav Guest

    That would probably work out far too expensive these days.


    --
    Beav

    VN 750
    Zed 1000
    OMF# 19
     
    Beav, Feb 29, 2008
    #19
  20. T i m

    T i m Guest

    It has since been suggested you can also buy it in 4l containers at
    (some) petrol stations but garden centres seem more likely for their
    paraffin greenhouse heaters.

    I also need some to wash out a washing machine motor (last resort, 18k
    to earth on the stator, tripping the RCD) so I'll get some tomorrow.

    All the best ..

    T i m
     
    T i m, Feb 29, 2008
    #20
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