Detachable Gas Tank - Any ideas?

Discussion in 'Painting, Welding, Bending and Gas Tanks' started by DuctTapedGoat, Jan 10, 2011.

  1. DuctTapedGoat

    DuctTapedGoat Active Member

    So, a couple years ago my chain snapped when I was in downtown Boise, and a fair distance from home. I figured I'd just toss it on the bus to get it home and throw on a new masterlink. The driver informed me that they don't allow gasbikes on the city bus bike rack for safety concerns in the event of a front end collision. Another time I had removed the tank and was waiting for the JB Weld to set on the holes and I was able to put it on the bus with only a quick response of "there's no gas tank, the motor is nonfunctional right now" without any problems.

    I was thinking about this today when I saw a bus drive by. In the event that it hits the fan and the bike is inoperable due to a shot rim, broken chain, seized motor, fried clutch, etc, it would be nice to know I have an emergency way to get it home.

    That's when it hit me - a detachable gas tank! Remove it from the bike, put it in a backpack and tell the driver that the motor is nonfunctioning.

    But, how would someone be able to remove the tank and affix it securely in a very short amount of time?

    All I can think of is chopping the tank bolts down and using a quick release nut with the arm on all four bolts, but I wanted to pose this to the community here and see if anyone else has any ideas!

  2. professor

    professor Active Member

    Don't think the driver will wonder where the tank is?
  3. DuctTapedGoat

    DuctTapedGoat Active Member

    He might, but I don't see a driver really questioning it.

    The time when I had the tank off I told them there was no tank, he looked and said okay then. And as their policy at least around here is concern for the front end collision, they wouldn't have reason to question it.

    Also, I'd make a secondary gas cap with no ventilation to keep any fumes down and spills from occurring in the backpack.
  4. Htown

    Htown Member

    why not use aluminum tanks that go in water bottle cage. Install peacock and a quick release. When getting on Bus close peacock, remove plastic line, and throw it in your backpack. Maybe look into some sort of cap for peacock valve, or locking cap.
  5. motorpsycho

    motorpsycho Active Member

    Dzus fasteners, like the ones used to hold body panels together on drag cars. You would probably have to make a couple of brackets to hold the dzus faster mounts to, and weld them to the frame and gas tank. But the brackets that they sell may work as they are.
    These fastenrs go on and off with 1/4 turn using a special wrench, flat screwdriver or sometimes even a quarter will work.
    If they can hold hoods, fenders and trunk lids on drag cars at over 200 mph, they surly would hold a gas tank on one of these bikes secure.

    You would have to come up with something to plug the gas line after you pull it off the carb. fitting to keep your backpack from smelling like gas. A simple solid brass fitting would probably do the trick.

    Another thing to consider is that the gas cap is vented, and if gas were allowed to come in contact with the inside of the cap (like if the tank accidentally got turned upside down in your backpack) gas can leak out.
    Last edited: Jan 11, 2011
  6. DuctTapedGoat

    DuctTapedGoat Active Member

    Great tip on the fasteners! I haven't used them before, but after looking over their site, it seems like they could provide just what it would take.

    A cap would be very important for the petcock, it wouldn't take much for that to get turned in a backpack. Good call.

    I definitely would have to modify a gascap and devent it, but I think that'd be the easiest part of a project like this.
  7. Goat Herder

    Goat Herder Member

  8. Goat Herder

    Goat Herder Member

  9. DuctTapedGoat

    DuctTapedGoat Active Member

    Those quick connect fuel couplings are awesome - that's just what the doctor ordered!

    For short distance riding and even emergency fuel, the handlebar cupholder would be great as well for the portable tank units.
  10. Htown

    Htown Member

  11. Dave C

    Dave C Member

    just remember those quick breaks are not dry. An extra set of couplers with the ends sealed would solve that problem but that's starting to get a little spendy :p
  12. davidstipek

    davidstipek Member

    For plug use zip tie with mounting hole. Tighten tie to fuel line. attach a brass bolt that you have ground threads off to fit inside line by drilling hole in end of bolt and get some plastic coated steel fishing leader loop line through drillrd hole and though loop in line. then choose your length and using jewelry eyelet make loop in line and insert though hole in zip tie and it is secure. If you choose to use Dutz fasteners you can secure them to bike same way so you won't missplace.
  13. hammer5312

    hammer5312 Member

    custom gas tank using velcro straps.
    make some wing nuts...
    Camouflage the gas tank and leave it on the bike...
  14. wheelbender6

    wheelbender6 Well-Known Member

    There was a post from a guy on one of the motorbike sites that used a soda bottle for a temporary fuel tank and tossed it when empty.
    The poster had to travel for a living and he could not find anybody that would ship his motor bike because it had a fuel tank.
    To solve this, he devised a stopper that will fit in a soda bottle and accomodate a fuel line and vent line. He simply tosses his fuel tank in the recycling before shipping the bike to his next destination.
  15. Soda Bottle Stopper

    That might have been me. They work like a charm and no need to sneak your fuel tank onto the bus. Just drink a new one wherever you arrive. Designed for diaphragm carbs, so they're completely fumes. If anyone needs one, let me know.

  16. bando_red

    bando_red New Member

    there is really an endless amount of ways to solve this problem. Since there are modifications to the way the tank is functioning,

    the first simple stupid cheap way that comes to mind for me is welding or epoxying a nut to the frame of the bike, and then epoxying bolts onto the gas tank where you want to mount it. then its just like screwing on a bottle cap. If you don't want it to be so obvious asthetically you could drill into the frame and mount the nut or bolt inside it.
  17. BTW if you do carry the "tank" in your backpack be warned that any fuel that just might accidentally leak out will melt holes in the nylon cloth in your pack.
  18. buzbikebklyn1

    buzbikebklyn1 New Member

    Water bottle gas tank

    Heres a nifty one thats saved me the same type of shipping problem.
    Get one of those cheap stainless steel water bottles from k mart, gently drill the screw on cap for 1/4 inch steel or copper tubing. One as the gas line the other as a vent and epoxy them in place use small bolts to plug the lines when its not in a standard bottle cage. Quick, cheap and effective, and it looks like a normal water bottle.

    Attached Files:

  19. Richard H.

    Richard H. Member

    No kidding. I can feature a quick release fuel tank perhaps having merit for needing to store a bike separate from a load of fuel, like for apartment dwellers say, but the thought of slinging a loaded tank in a backpack and getting onto public transit seems fraught with possible unintended consequences.

    I always thought the best advantage of a motor assist bicycle was supposed to be if the motor assist just pedal home? :grin5:
  20. DuctTapedGoat

    DuctTapedGoat Active Member

    Well, lots else can fail besides the motor.

    Motorized bike has two parts - Motor and Bike.

    What when the bike part fails? (and I mean FUBAR fail)