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Thread: Fuel efficency

  1. #1
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    Fuel efficency

    heya guys
    ever since i replaced the fuel lines on my k5 GS500, i have got a extra 40km out of my tank, and still going!
    why would this be?
    it aint on reserve either, i have the lines around the correct way.
    the standard lines were shit, thin and weak, got some proper onmes on their now, correct size too!
    how can this be?

  2. #2
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    you put the correct amount of fuel in for a change?...( you FILLED it up tothe top)


    what a ride so far!!!!

  3. #3
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    Quote Originally Posted by ajturbo View Post
    you put the correct amount of fuel in for a change?...( you FILLED it up tothe top)
    after 23 bikes...i should hope so.

  4. #4
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    Quote Originally Posted by carver View Post
    heya guys
    ever since i replaced the fuel lines on my k5 GS500, i have got a extra 40km out of my tank, and still going!
    why would this be?
    it aint on reserve either, i have the lines around the correct way.
    the standard lines were shit, thin and weak, got some proper onmes on their now, correct size too!
    how can this be?
    If you care to do a little maths.

    Your fuel lines are basically a hollow cylinder.

    Work out the volume of you old lines

    Work out the volume of you new lines.

    If as you say the new lines are fatter than the old then they will hold more fuel in them.

    It doesnt take much in the way of a diameter change to vastly increase the voulume of a cylinder.

    You are probably not being more fuel efficient but rather carrying more fuel than before.

  5. #5
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    Quote Originally Posted by Dai View Post
    If you care to do a little maths.

    Your fuel lines are basically a hollow cylinder.

    Work out the volume of you old lines

    Work out the volume of you new lines.

    If as you say the new lines are fatter than the old then they will hold more fuel in them.

    It doesnt take much in the way of a diameter change to vastly increase the voulume of a cylinder.

    You are probably not being more fuel efficient but rather carrying more fuel than before.


    not true.
    my new lines are 200mm longer, but of course the same I/D, for the fittings.
    my bike usually does 18-20k/litre, your theory indicates a extra 2lt being carried in the lines!

  6. #6
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    Logically it doesn't make any sense that your fuel lines would make any difference to your mileage.

    The only thing that I can come up with is that you've been riding a wee bit more conservatively after the change. The same as you always seem to get better mileage after you've done an oil change (as you listen for any sign that you've got something messed up).

  7. #7
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    Quote Originally Posted by Pwalo View Post
    Logically it doesn't make any sense that your fuel lines would make any difference to your mileage.

    The only thing that I can come up with is that you've been riding a wee bit more conservatively after the change. The same as you always seem to get better mileage after you've done an oil change (as you listen for any sign that you've got something messed up).
    yep, done that too-the oil change!
    that could be it.

  8. #8
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    8th December 2005 - 18:37
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    Just a geuss - but perhaps your old lines were 'weeping' fuel. When you say 'the old lines were shit' I assume they were cracked or hard...

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