PVC gas tank question. Please help

Discussion in 'Motorized Bicycle General Discussion' started by taddthewadd, Feb 15, 2010.

  1. WayneC

    WayneC New Member

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    Just For Info, The Grey Pipe Is Cpvc. It Is Chemical And Heat Resistant.
    It Is Used In Many Industries Just Because Of Those Properties.
    In My Business (swimming Pools) It Is Used To Connect Directly To Pool
    Heaters Without The Use Of Heat Sinks.
    Will Be Good For Gasoline, Albeit A Heavy Tank.
    Make Sure You Use Cpvc Cement To Maintain The Chemical Resistance And
    Proper Bond.
    And That's All I've Got To Say About That.
     
  2. K.i.p

    K.i.p New Member

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    Good call on the proper adhesive, I had forgotten there are a couple types, the cans look almost identical and are often stocked side by side. Check that label.
     
  3. Elmo

    Elmo New Member

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    There is a type that is good for pvc and cpvc. regular grey conduit is pvc. I have ran several thousand feet of this stuff and used pvc glue with no failures.
     
  4. ferball

    ferball New Member

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    Some Pvc glue is not gas resistent,and regular white PVC will degrade with prolonged UV exposure, nothing critical but it will become more brittle, so i believe the grey conduit might make a better long term tank. That being said I will probably make a regular white pvc tank this week end because that is what i have lying around.
     
  5. taddthewadd

    taddthewadd New Member

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    I have abandoned the PVC tank. I made one and had gas in it for several months and everything seemed ok but I decided not to keep it just in case it wouldn't hold up over time. I built a apple juice tank instead and it came out really good and now I have peace of mind.
     
  6. junked

    junked New Member

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  7. mapbike

    mapbike Active Member

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    In the case of the sun degradeing the pipe I would think that most would paint the tank and this would cure the sun exposure issue, as for the glue to use I think I would use Seal-All contact Cement, I have used it on gas tanks and to seal threads on carb. fittings, even fixed a brass carb float that had a hole in it with the stuff, Gas and oil will not bother it at all.

    I had thought about the PVC tank myself but was unsure about if it could take the gas, now I'm for sure gona build me one for one of my bikes.

    pics are of the Seal-All I mentioned earlier, Home Depot has it in there area where they stock all the super glue and Epoxy glues over by where they mix and sell their house paints and supplies
     

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  8. ferball

    ferball New Member

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    Almost have my tank done, when I can escape the wife and kids for about a couple hours I will finish it and hopefully post a how to, so far I am in to it about 12 bucks at Lowes. Have it all mocked up just need to glue it together, install it, and test it. My only concern is my DIY vented gas cap, looks good in theory but I have to see how it tests, all in all it is shaping up to be a sweet under bar tank. Now I just have to find a banana seat and ape hangers to have my dream machine complete.
     
  9. Flounder

    Flounder New Member

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    I would like to see some pics.. I like the idea of a pvc tank. Cheap and easy.
     
  10. ferball

    ferball New Member

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    Here is a pic of my tank, still needs to be cleaned and glued, but you get the idea. I'll post a tutorial it was super easy.
     

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  11. Flounder

    Flounder New Member

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    coming along nicely, Make sure you use a cap that allow the gas to vent or you could be dealing with pressure issues blowing off your fuel lines or flooding the carb.
     
  12. katoomer

    katoomer New Member

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    On my goped I made a tank out of a large plastic soda pop bottle. I had the extra long type drink bottle holder on it. You have to make a new gasket from cork for the cap because of the type of plastic in the cap is not the right type. I used expoxy and put the plastic fuel line nipples through the plastic. Both supply and venting. It worked great. That plastic does hold up long term.

    On my 2-stroke dirt bike I take a 2 liter jug of gas in my back pack. Just be sure to make the cork gasket in the cap. And I have pressured these jugs up to 50 psi also when making home made pop.

    You may be already done there, but this is just a suggestion to think about. I've talked to others who have done the same as I.
     
  13. ferball

    ferball New Member

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    It has a vented cap. That in theory should work fine, but I need to put some miles on it before I swear by it.
     
  14. beentryin

    beentryin New Member

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    heres my pvc tank held up for a few months no problem
     

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  15. Dan

    Dan Staff
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    Nice Been. Hadn't thought of that for a cap. How is it vented?
     
  16. beentryin

    beentryin New Member

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    just used a small bit drilled thru the top part and bottom part works great no gas spillage like peanut tank
     
  17. scotto-

    scotto- Custom 4-Stroke Bike Builder

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    That looks more like ABS than PVC....unless you painted it black? ABS is the black stuff, PVC is the white. Is that ABS? Just curious.
     
  18. taddthewadd

    taddthewadd New Member

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    I am sure he will tell us but it looks like it is painted grey or something to me. Look at the glare off of it, it is too shiny to be ABS
     
  19. darkhawk22

    darkhawk22 New Member

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    I'm building up a PVC tank as well. Mine has several parts so we will see how it works. So far i've got it built up and sealed on the inside. Now the JB weld on the outside is drying. The filler has been sealed with JB weld and is holding great. The vent will be 3/8 tubing. Once the top is one and sealed i'll sand and prime it with some plastic paint and then the color of my bike (red) then lastly a clear coat. It's a lot of work but should be worth it in the end. I do need to know what size the fitting for the gas out should be? I believe a 1/4 NPT Female should work, but someone correct me if i'm wrong.
     
  20. MotorBicycleRacing

    MotorBicycleRacing Active Member

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    The stock Chinese shut off valves are 10 mm 1.0
     

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