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Empty the GS Fuel Tank - the easy way

Discussion in 'GS Boxers' started by Poolside, Jun 29, 2005.

  1. Poolside

    Poolside Syndicated

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    <BR>So I need to remove the fuel tank and as usual, I just filled up the tank. D'oh!

    Make this handy fuel drain hose, and let the fuel pump empty the tank for you.

    Also works for aerial refueling of another bike.

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    The fuel system continually recirculates the fuel. The fuel pump sends high pressure fuel to the regulator. And the regulator returns low pressure fuel to the tank. This method of empthing the tank simply intercepts the returning fuel. So instead of the fuel dumping back into the tank, it dumps into the gas can. The fuel system does not even know this is happening.

    Start the engine and let the fuel pump drain the tank. Flow rate is slow, and low pressure. You can see in the picture above that the hose is staying in the gas can unattended. Smooth easy flow. A little stronger, but about what you'd expect from a good siphon.

    Watch the fuel coming out of the end of the hose. Right after the fuel pump intake impeller begins to whine, the fuel flow will sputter. And you can shut off the engine. This is not an issue for the fuel pump.

    At this point the tank has about 1 gallon remaining. If you have an Adventure tank with a crossover OR an S4 siphon crossover maybe about 1/4 gallon. johnjen's S4 siphon crossover can be found here.

    If your tank does not have a crossover, and you want to get most of the remaining fuel out, there is a way. Lean the bike over on its right side, for the best result, touch the cylinder to the ground. The remaining fuel will pour over the tank's 'internal saddle' and into the right side lobe. The pouring fuel is clearly audible.

    Reset the bike on the center stand, put the drain hose back into the gas can, and start the bike. About another gallon will pump out.

    Or, just take the tank off with one gallon of gas in it. Only 6 pounds. That sure beats 36!

    - Jim <BR><BR>
    #1
  2. kdude

    kdude Happy to be here !

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    Excellent ! Hope I just hpe I never have to do it. :D
    #2
  3. HarveyMushman

    HarveyMushman Long timer Supporter

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    Thanks, Jim. :thumb
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  4. Kaumajet

    Kaumajet H.I.D. Positive

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    Very cool idea :deal Thanks for sharing. :thumb
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  5. HIgh Water

    HIgh Water Waisting Time

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    Unfortunately you will when you have to change the fuel filter. Unless of course you clog your filter on a near empty tank ... could happen.

    I did the same thing last year so I could be a gas station for my friend's small tanked bike. Works well!
    #5
  6. simonm

    simonm Stealth Adventurer

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    Another post of the highest quality - thanks :thumb
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  7. NJ_Bob

    NJ_Bob Occasional Adventurer

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    Jim - totally awesome - thanks! Dang good photos too. What do you use to add the text?


    It may be obvious, but the technique of leaning the bike to the right to get that extra fuel out can also be very useful when you appear to run out of gas while riding.

    DAMHIK. :rolleyes
    #7
  8. nmrider

    nmrider Close Personal Friend of

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    Thanks for posting that!

    I was siphoning a tank of bad gas out of my GS last week, but couldn't get the last two gallons out of the tank.

    Good Job.
    #8
  9. TonyA

    TonyA beta tester

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    Jim,

    Super job!

    Do you need to run the engine to get fuel to flow? I always thought that the fuel pump pressurizes up just by turning the key. When there's gas flowing and an open container of it in the work area, you'd usually want to really pay attention and minimize the things that can go wrong. Having the engine running just seems like an invitation for something uncontrolled to happen. like a marmot comes over and pulls down the shift lever or something. Maybe I'm just paranoid.

    But what I REALLY want to know is how you drew those nifty curved arrows over the pix.
    #9
  10. Poolside

    Poolside Syndicated

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    <BR>Thanks fellas. But I'd be nothing without Photoshop. :thumb

    Tony, the fuel pump must be on to do this. Either the engine must be running, or you can make a power jumper to the fuel pump connector, and operate the pump on battery power with the engine off.

    I think I found out about the tilting the bike after running out of gas the same way you did Bob. :D

    When the fuel pickup start to whine during braking, gas it hard from a 5mph roll, and try to lean the bike a little to the right. That gets most of the remaining fuel to slosh over to the right side. But then you'll have to take off easy or the fuel will slosh back. If doing this regularly, the typical fuel fill is right at, or a little more than, 6 gallons.

    - Jim<BR><BR>
    #10
  11. Jim Moore

    Jim Moore Lyin' Dog-Faced Pony Soldier

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    That's just freakin' brilliant.
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  12. Jim Moore

    Jim Moore Lyin' Dog-Faced Pony Soldier

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    I'll bet an ice-cold beer you have never successfully performed that particular technique on a GS and ended up with a fully drained tank.
    #12
  13. L.A.

    L.A. Long timer

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    Thanks for the tip! :nod
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  14. Anorak

    Anorak Woolf Barnato Supporter

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    What works almost as well and is much simpler is to attach th drain hose to the return line on the tank and use gravity. When it stops flowing move the tank into different positions. This will leave about half a gallon which will mostly keep to itself and not bother you while changing the filter.
    #14
  15. Poolside

    Poolside Syndicated

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    <BR>
    I don't know FB. The height of the fuel return port inside the tank is above the one gallon level on the right lobe of the tank. So that leaves about two gallons, if you count the left lobe of the tank.

    Or, since you are talking about moving the tank around to different positions, are you meaning to do this after the tank is removed?

    - Jim<BR><BR>
    #15
  16. Hotspice

    Hotspice Satellites not acquired

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    I'm with you on this one.. A little fuel line and a NAPA electric pump has always done the job.. run a wire hanger along the outside if the fuel line and you can flex it to get into most of the nooks and crannies..
    #16
  17. MikeO

    MikeO Long timer Supporter

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    Jim,

    tangential question - what program do you use to prepare your excellent annotated photos & diagrams (which I've copied onto my hard drive - certain to come in useful some time in the future :thumb)?

    On the subject of draining the tank, I had to drain completely to ship my bike out to the USA and to fly it back. It was a bitch of a job - I ended up taking it off and holding it upside down over a bucket in a (vain) attempt to shake the last dregs out. I left the fuel cap open for a couple of days, but the time of year (Jan in UK - Nov in New York) meant that the ambient temperature didn't help...

    Eventually I just said 'bollocks' and delivered it to the shipper - neither of whom checked :lol3

    Mike
    #17
  18. pilot

    pilot ...

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    That is the technique I used this morning to drain my tank to look after a leak at the pump plate o-ring. :thumb
    #18
  19. Poolside

    Poolside Syndicated

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    <BR>
    It is Photoshop that does all the work Mike.

    - Jim<BR><BR>
    #19
  20. captain mark

    captain mark Just havin' fun

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    glad someone thought of an easy way to empty the tank. thanks much
    #20