Gas Cap question - venting too much

Information and questions on GL1100 Goldwings (1980-1983)
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mad max 1983
Posts: 1
Joined: Sun Sep 25, 2016 6:32 pm
Location: Southwest Michigan
Motorcycle: 1983 GL1100i

Gas Cap question - venting too much

Postby mad max 1983 » Sun Sep 25, 2016 6:46 pm

Guys, long time lurker here first time caller. Y'all are much appreciated for sure.

My ride 1983 Wing has 3 seasons 6000 miles with me. I am aggressive short-rides rider.
Problem has been air pocket in fuel line gets to carbs and bogs the bike. Rotating the petcock resolves the problem but this is dangerous as you guys know.

I have replace factory filter, pump, petcock (would leak at rotator shaft). Summer of 2015 the gas cap spent all non-riding hours in a can Seafoam. A lot of brownish stuff came out.

This season still experiencing some air -starvation. During hard and moderate acceleration, some air can be seen in the line entering the pump. Gas Cap is completely free flowing air.

Did I dissolve a cork gasket or something inside the cap? I think now the cap does not hold any positive pressure. To mitigate I cut some gasket material to partially block the 4 exterior vent holes in the cap. What is going on?

Posts: 119
Joined: Sun Sep 26, 2010 5:28 pm
Location: long beach, ca
Motorcycle: 83 GL1100 I

Re: Gas Cap question - venting too much

Postby indianakid » Sun Sep 25, 2016 9:01 pm

This may help you get a better understanding of your gas cap.


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Posts: 165
Joined: Sat Oct 12, 2013 7:00 am
Location: Pittsburgh, Pennsylvania
Motorcycle: 83 Goldwing Interstate

74 BMW R90/6

Re: Gas Cap question - venting too much

Postby Overdog » Mon Sep 26, 2016 10:50 am

This seems like more of a float level problem to're not running off of what's coming down the fuel're running off of what's in the float bowl.

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