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Does the fuel cap vent go both ways?

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  • #1

    Does the fuel cap vent go both ways?

    Just wondering... Does the vent in the fuel cap allow air to go in AND out, or just in, to fill the space created by fuel as it is used up? The reason I ask is that I notice when I park after riding, I often (not always, and fuel level doesn't seem to matter) get a tiny amount of fuel out of the airbox. Only a couple of tablespoons or so. I was thinking that maybe there is pressure being built up inside the tank, and that is pushing the fuel DOWN, past the octy valve and the floats. Just enough to relieve the pressure. Might I be able to allieviate this problem by rebuilding the fuel cap vent? I've never had an issue with a vacuum in the tank, so I know it's letting air IN, so I wonder if it's just not letting fumes OUT.
    1980 XS850SG - Sold
    1981 XS1100LH Midnight Special (Sold) - purchased 9/29/08
    Fully Vetterized and Dynojet Kit added, Heated Grips, Truck-Lite LED headlight, Accel Coils, Irridium plugs, TKAT Fork Brace, XS850LH Final Drive & Black SS Brake lines from Chacal.
    Here's my web page devoted to my bike! XS/XJ User's Manuals there, and the XJ1100 Service Manual and both XS1100 Service manuals (free download!).

    Whether you think you can, or you think you cannot - You're right.
    -H. Ford
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  • #2
    I would think so Bug. Least mine makes funny venting noises after parking when hot.
    81H Venturer1100 "The Bentley" (on steroids) 97 Yamaha YZ250(age reducer) 92 Honda ST1100 "Twisty"(touring rocket) Age is relative to the number of seconds counted 'airing' out an 85ft. table-top.

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    • #3
      There is not a check valve or anything, it is just a hole open to atmosphere.

      So you have a float valve problem that lets the fuel from the octy down drain past the floats needles.
      Nathan
      KD9ARL

      μολὼν λαβέ

      1978 XS1100E
      K&N Filter
      #45 pilot Jet, #137.5 Main Jet
      OEM Exhaust
      ATK Fork Brace
      LED Dash lights
      Ammeter, Oil Pressure, Oil Temp, and Volt Meters
      Green Monster Coils
      SS Brake Lines
      Vision 550 Auto Tensioner

      In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.

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