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Old 03-15-2011, 09:08 PM
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Default Gas Tank Vent Line

This may sound stupid,,,, but here goes.
What is the purpose of the gas tank vent line i see drilled thru the gas cap on some machines?

Vents excess pressure, eliminate gas boiling, doe it have a regulator of some kind??
How far into the tank the the line go?
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Old 03-15-2011, 09:13 PM
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-Prevents a vacuum while riding- fuel gets to carb easily.

-Prevents overpressure of tank- fuel gets to carb too easy. And won't make the cap jump off into your face when unscrewing it
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Old 03-15-2011, 09:29 PM
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AAAAHHHH.. I see
So that is primarily for natuarlly aspirated machines.

Thanks for the explanation
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Old 03-15-2011, 09:50 PM
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Quote:
Originally Posted by gspman View Post
AAAAHHHH.. I see
So that is primarily for natuarlly aspirated machines.

Thanks for the explanation
Actually - no!

All tanks are vented in some way or another. If they were not vented
the vaccume would prevent the fuel from freely flowing out of the tank
Many Atv & dirt bikes have a vented cap with the vent line running into
the frame so if gas were to come out it wouldn't get on the paint / plastics.

Some people replace their long vent lines with a shorter one and a ball valve on the
end so air will be allowed to enter the tank, but water, dirt are kept out.

Newer technology has the tanks venter elsewhere, but that are vented....................
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