Gas tank cap vent
jloeppke at charter.net
Mon Jul 2 19:51:15 PDT 2007
So thats the reason I hear a whistle from the cap. Learn
something every week about my bike on this blog.
On Jul 2, 2007, at 8:10 PM, Art Lischer wrote:
> Had similar happen in E CO on way to Fandango. Try fiddling with
> the vacuum line to the petcock. It might be kinked causing petcock
> to shut off fuel supply when in "ON" position.
> Also try rearranging the carb bowl vent lines; if the ends of the
> hoses get in a place where there is air or turbulence it won't
> allow bowls to vent and slows gas flow.
> Does the cap whistle or whine after sitting a few minutes in the
> sun? If so the cap is venting properly.
> HTH, Art in DM
> Larry Zoia wrote:
>> Could someone enlighten me as to a procedure to check whether or
>> not the gas tank cap vent is patent?
>> I suspected a venting issue, so of course I shot some
>> WD-40 into the holes and blew them out with compressed air. When
>> my problem didn't resolve, I
>> (belatedly) looked in the manual. It didn't tell me how
>> to check the venting. It DID tell me not to use compressed air.
>> During long periods of sustained high speeds (80-90 mph from
>> Michigan to NJ this weekend) I noticed symptoms of fuel starvation
>> which were ameliorated
>> somewhat by running with the petcock in the Prime position.
>> Coming out of a gas stop, the bike, warm, runs great for about
>> 20 minutes at 85 mph or so, and then the starvation symptoms
>> begin. Same thing when I stop to pay a toll with the petcock in
>> the Prime position. I tried to look at the glass filter on the
>> fly to check the amount of gas therein, but that manuever seems to
>> result in a soft left turn and horns being honked.
>> Sooo...my plan is to check the flow through the inline
>> filter (glass) to make sure the filter isn't the issue, then
>> remove and inspect the petcock for....well, whatever I
>> might find, and then back to square one with the venting.
>> I do have a recently installed Stage III jet kit, but my
>> mileage has been around 44 mpg for aggressive highway (turnpike)
>> I remember hearing what I interpreted as air being sucked through
>> the cap vent after idling the bike in the
>> garage for a few minutes, and this is what prompted me
>> to blow out the holes.
>> Thanks in advance for any responses.
>> Larry in Michigan
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