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Thread: petcock angle extension

  1. #1
    Member danwray's Avatar
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    i was sitting around thinking about how much gas my new clark xt tank is holding down in the front that is basically going to waste. i thought about trying to relocate the petcock, or just adding a drain tube and piping it in somehow, and then i thought maybe i could somehow angle one of the fuel pickups on a petcock assembly and add an extension tube so it reaches the front of the tank. my question is will the fuel travel through the extension even if it travels at an upward angle and then makes a 90 degree turn down to the carb. is there a vacuum in the fuel system, or is it simply gravity fed?

  2. #2
    Senior Member Rainman's Avatar
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    Should be all gravity.
    If you can't find it, grind it

    1990 TW200

  3. #3
    Senior Member RisingSun's Avatar
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    Well Harley guys have a style called Frisco style. The petcock is relocated to the rear of the tank and the front is raised to tilt it.

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  5. #4
    Member danwray's Avatar
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    went ahead and bought an extra petcock just to try this out. ended up cutting the extended part off and putting some fuel tube on it and part of a coat hanger to keep it aimed in the right direction. then I stuck the part I cut off, with the filter, on the end. I tried it out today, was able to get to about 215 miles before I switched over to the new reserve, don't know how many more miles I can get out of that yet, but so far there were no problems with it having to suck the fuel up the small angle in the tube. before the mod I usually had to switch over to reseve around 160 to 170.

  6. #5
    Senior Member mrlmd's Avatar
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    It should flow by gravity unless the loop is high and you run dry or low and get an air bubble in the line, like a waste trap - that would break the siphon.

  7. #6
    Senior Member peruano's Avatar
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    Maybe you need a turkey baster (tube with squeeze bulb on the end) so you can suck the gas from the front of the tank and squirt it into the back part where the petcock outflow is located. Low tech - fail proof if you try it at home and caution others not to try it because you are a professional. Just offering an alternative. BTW I'm pretty sure I have a big not easily accessible reserve with my oem xt350 tank, but have never driven it to the fumes to determine how much. Good luck. Tom
    Tom - TW200 2002, Kawasaki VN 500 2006

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  8. #7
    Banned qwerty's Avatar
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    Make the effort to remove all the air from your see-through fuel filter, take a short ride, and it will develop a bubble within. I've no idea from where the air comes for sure, but I'm thinking past the float needle when it opens.




  9. #8
    Senior Member bikerjosh's Avatar
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    Quote Originally Posted by danwray View Post
    went ahead and bought an extra petcock just to try this out. ended up cutting the extended part off and putting some fuel tube on it and part of a coat hanger to keep it aimed in the right direction. then I stuck the part I cut off, with the filter, on the end. I tried it out today, was able to get to about 215 miles before I switched over to the new reserve, don't know how many more miles I can get out of that yet, but so far there were no problems with it having to suck the fuel up the small angle in the tube. before the mod I usually had to switch over to reseve around 160 to 170.


    Any pictures danwray? I'm in the middle of a tank install myself and trying to mount the tank to get the most out of it.

    thanks Josh
    Not all men are capable of greatness, but all possess toughness.
    2001 TW a mod or two maybeHidden Content

  10. #9
    Senior Member peruano's Avatar
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    An interesting exercise that several folks need to do is to determine how much gas we actually have available (i.e. will run out of the petcock outflow). Forget what the dealer or manual says - what really counts is how much gas will run out of the fuel petcock when the bike is setting level and upright. Its simple - just fill tank and then remove fuel line and let it drain into a fuel can and measure once it stops. Then shift to the reserve and measure what comes out then. Have the kitchen measuring cups available to get a good measurement. As I recall when I was shifting out my stock tank, I drained from the main petcock setting, and then shifted to the reserve. Unfortunately the tank was off the bike but positioned level, but as I recall I got a lot more gas out of the tank from the reserve than I expected. What? You want me to recall exactly how much?- no way - but it was a lot. I seem to recall that it was close to 3/4 of a gallon or essentially the 0.8 of the 1.8 tank. Meaning we (you) are running on a gallon of gas until we switch to reserve. With my 3.2 gallon tank, I may have as much as 1 gallon in reserve, but I have no idea how much of it is available to me because I have not done my drain and measure exercise. Cheers, Tom
    Tom - TW200 2002, Kawasaki VN 500 2006

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  11. #10
    Member danwray's Avatar
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    sorry man, no pics, but it's working so well I might take it apart to document it. It's actually pretty simple though, if you have some questions let me know.

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