F800GS Auxiliary Fuel Tanks

Discussion in 'Parallel Universe' started by Neubz, Aug 26, 2008.

  1. ebrabaek

    ebrabaek Long timer

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    I have been toying with a small extra tank build myself for a few years...... and was thinking in the same lines as this tank.....utilizing the stock tank inflow/vent line as feeder as well... But what has kept me from this is what happens when the aux tank fills the stock to the max....with no air trapped in the stock....and hot ambient temps.....makes the stock fuel expand....say when your parked.... Does the fuel then flow back up into the aux tank....since it is now in between the stock...and expansion line.....????? If yes... I hope the install sheet for the adventure tank tell you to remove the little " one way check valve" ( not really a check valve)....because the moment fuel enters it.... it will NOT allow ANY matter against the arrow. I just thought I would throw this out there.... and perhaps I should not speak of the adv tank..... since I don't know how it is hooked up.... I am just curious.....:thumb:thumb

    Erling
  2. Ducksbane

    Ducksbane Quaaack!!!

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    I have a XChallenge as well as the 800GS and it has the Dutch X Tank which uses the same vacuum system and it works perfectly. It has a vent on the second filler on the auxiliary tank, so I assume that sometimes a bit of fuel goes the other way. I don't think this is a problem as it will flow back ito the main tank again. I don't think it has a one way valve in the line.
  3. ebrabaek

    ebrabaek Long timer

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    I see...... I just got nervous as when I did the checking on that little valve... I found that it blocks anything against the arrow when liquids entered it...... Thanks.....:thumb:thumb

    Erling
  4. GB

    GB . Administrator

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    I installed the ADV tank over the weekend. It took me about half an hour tops.

    It fits nicely and the aluminum rack will come in handy to mount my Motofizz bag.

    The supplied (and online) instructions are excellent.

    The only thing I'm not crazy about is the venting hose that attaches to the filler cap. I had something identical on my KLR's plastic IMS tank, in the end I ended up removing it and mounting this vent doodad in the pic below.
    Do youse see any reason I should keep a venting hose on the filler cap, that basically goes back under the seat and ties into the bike's venting hose that I disconnected from the tank. (My bike does not have the evap. canister).

    [​IMG]

    My riding season begins this week. I will fill the ADV tank at the gas pump and snap a pic of its capacity. And then let the riding begin. I'll update this thread with my mileage range. I'm taking my GS to Colorado this summer for some touring and D-S exploration, so that's where the extra fuel will come in handy.

    p.s. will post pics of the tank on the bike once the bike is back in the garage.
  5. Lost Roadie

    Lost Roadie Rider

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    That looks pretty nice GB, do you have any photos of the bottom of the tank prior to install?


    Thanks!
  6. ebrabaek

    ebrabaek Long timer

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    No need to keep the old vent.with you CC removed as long as the new vent through the adventure tank is in place....then expansion/consumption issues are addressed....:thumb:thumb

    Erling

    Edit..... The little plug you installed in the adv tank's cap does allow for in and out flow...right...??
  7. GB

    GB . Administrator

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    No pic of the bottom, but it's basically the same shape as the pic in post #201, but it's flat, no hump near the back. There are 2 holes thru the tank for the rear mounts.

    The bike is currently parked about a foot out from a wall behind the it, I tried to take a pic of the back of the bike, but it didn't turn out. Will do so soon.

    Yes, I put it in my mouth and was able to breathe in and out. :lol3 I had it on my KLR, hence the red top. I will go thru my first tank of gas with it on and report back.

    For steady cruising, I expect a range of 500 to 550 km. We'll see.
  8. bobobob

    bobobob IN HOC SIGNO VINCES

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    Will that work with the F650GS or G650GS?
  9. GB

    GB . Administrator

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    I don't see why not.

    This one is designed to mount into the 4 holes for the luggage rack / top case mounts of the 800GS/650GS.

    On the 650GS thumper, if you have a mounting plate for a luggage rack, you could easily adapt it to fit it. You just mount the Adv tank on it, and run the hose to the vent line of the stock tank.
  10. bobobob

    bobobob IN HOC SIGNO VINCES

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    Thanks.

    I've also been looking at these to mount on the pillon and save the rack space for a top box.
    1.5 gal., 6"x16", $189. Not as compact or off road worthy as your set up, though.

    [​IMG]
    [​IMG]
    [​IMG]


    http://www.tourtank.com/TourTanks.html
  11. twinrider

    twinrider pass the catnip

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    [​IMG]

    Very cool, shame it can't be used with a top case.
  12. GB

    GB . Administrator

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    Says who? :evil

    Stay tuned... :lurk
  13. Ducksbane

    Ducksbane Quaaack!!!

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    That is a lot like the way the XTank comes ...

    [​IMG]

    Great minds really do think alike ! :lol3
  14. twinrider

    twinrider pass the catnip

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    :lurk
  15. GB

    GB . Administrator

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    I had that exact same bike and X tank!! So I knew how well the vacuum system worked and that vented cap. :lol3
  16. bobobob

    bobobob IN HOC SIGNO VINCES

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    Otay, I'm tuned... :lurk
  17. GB

    GB . Administrator

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    Well, today was my first day back on 2 wheels for this season.. I filled the adv tank. I put the bike on the center stand.. and filled it to the top of the filler cap. Do this only if you intend to ride enough distance to burn off 1 liter, otherwise when you park it on the side stand, it might leak from the filler cap.

    I filled up at 4°C, a total of 6.46 liters, or 1.7 US Gallons.

    I'm going to start a new thread specific to the ADV tank to make finding this info easier, than digging thru this big thread.

    [​IMG]

    [​IMG]
  18. GB

    GB . Administrator

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