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Gas tank crud

Discussion in 'XJ Modifications' started by rdbhere2, Nov 11, 2008.

  1. rdbhere2

    rdbhere2 Member

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    I removed my gas tank and petcock for painting. I had about a handful of black crums come out of the tank. It didnt look like rust but, i guess it was. The length of the petcock denotes how much gas is used for reserve correct?
     
    rdbhere2, Nov 11, 2008
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  2. bill

    bill Active Member

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    Wonder if it was some rubber from the seal or an old seal?

    Anyway you are correct - reserve is determined by the "fuel" position intake height. I have never taken my petcock apart so i don't know if it is adjustable/changeable.
     
    bill, Nov 11, 2008
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  3. bigfitz52

    bigfitz52 Well-Known Member Premium Member

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    Yep. Take a look at the nylon screen 'standpipe" and you'll notice that the reserve opening goes all the way down while the other side doesn't. They're not adjustable/changeable with the stock parts.
     
    bigfitz52, Nov 11, 2008
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  4. dqnjuan

    dqnjuan Member

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    not sure what the stock petcocks look like, but my aftermarket petcock I just saw'd down the tube to make my on larger and reserve smaller.
     
    dqnjuan, Nov 11, 2008
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  5. rdbhere2

    rdbhere2 Member

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    The petcock screen in my 650j is four inches long, i assumed it would be only about 2 inches. The last time i saw a petcock screen i was 10 years old and my bike was a Honda QA50.The tank was full of 1/8" to 1/4" size black crums.I guess the rust in the tank coagulated forming these crums.
     
    rdbhere2, Nov 11, 2008
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