Fuel line help
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Thread: Fuel line help

  1. #1
    Junior Member zoolander's Avatar
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    Fuel line help

    I install a new gas line (not OEM) and I noticed that gas doesn't flow into it and much less through it. It's a clear tubing so I can see there are no obstructions. Once I disconnect either end and turn the fuel petcock on, gas flows from the tank immediately. What is going on that I can't get gas to flow through the line?

    its very strange because this gas line has been on for about two years. It's alway been a hard starter but now I wonder if it hasn't just been this gas line problem all along. Still, I don't know what the problem is. Please help.

  2. #2
    Senior Member sponge's Avatar
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    OK deep breath here. All of that info would be helpful, but tubing is a pretty low tech part I think we might get by with what you supplied.
    Step 1 Is the clear tube Gasoline stable or did you just desolve a bunch of glue into your carb.
    Step 2 does gas flow when the tube isn't connected to the carb?
    step 3 does gas flow when you start the bike and burn enough fuel to open the needle valve in the carb?

    Start there then we can get into what is likely wrong with your carb.
    Chris Vogel
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  3. #3
    Junior Member zoolander's Avatar
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    Quote Originally Posted by sponge View Post
    OK deep breath here. All of that info would be helpful, but tubing is a pretty low tech part I think we might get by with what you supplied.
    Step 1 Is the clear tube Gasoline stable or did you just desolve a bunch of glue into your carb.
    Step 2 does gas flow when the tube isn't connected to the carb?
    step 3 does gas flow when you start the bike and burn enough fuel to open the needle valve in the carb?

    Start there then we can get into what is likely wrong with your carb.

    The inside of the tubing appears to be in good condition without any dissolving.

    Gas flows from the petcock freely when the tubing is disconnected from the petcock. I also connected it back onto the petcock and disconnected it from the carb and it flows from the tank. It seems to not flow only when both ends are connected.

    as for "step 3", I cant get the bike to start at all anymore.

    Is there some sort of back pressure or something created by the carb that would prevent the flow of gas into it???

    thanks for the direction/help!

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  5. #4
    Senior Member Fred's Avatar
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    Have you tried opening up the drain screw on float bowl cover to see if fuel is making it's way past float needle?
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  6. #5
    Senior Member jeepster09's Avatar
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    How do you know gas is not flowing when connected? Gas is also clear, my guess it is flowing and you just can't see it because it is clear and deceiving. If it flows when disconnected from carb and has no obstructions, it is working. You need to look elsewhere for problem.
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  7. #6
    Senior Member jb882's Avatar
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    Sounds like the float valve is stuck closed. When was the last time this bike ran?

    My advice would be to rebuild the carb using new parts, pro cycle sells a kit for years under 2000.
    Pair of 2006 TW's modded to the hilt and a Ducati Multistrada.

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  8. #7
    Senior Member Devils Advocate's Avatar
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    Quote Originally Posted by Fred View Post
    Have you tried opening up the drain screw on float bowl cover to see if fuel is making it's way past float needle?
    This. ^^^^

    Do this next. It is the next step before you go buy any rebuild kits or anything else. If gas comes out it's not the tube and then you may need a rebuild kit or just a good cleaning.

  9. #8
    Senior Member ssgtrillium's Avatar
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    Are the carb vents blocked?

  10. #9
    Senior Member Gulfrider's Avatar
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    Id say try the drain screw if no gas, then try to clean carb, still no go.. then order a rebuild kit. Install a inline fuel filter while your at it if not installed already.

  11. #10
    Senior Member Cornelis's Avatar
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    I had the same type of problem and I found out that he fuel pet-cock has filter screens on it inside the tank and they clog up and get brittle and prevent the fuel from flowing freely out of the tank, the fuel was flowing but not fast enough. I recommend that you unscrew the fuel cock from the tank and remove and inspect it for blockages and remove the filter screens if they are clogged up.

    If that doesn't fix your problem you're going to have to open up your carburettor.
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