Re: '95 900rr Tank Venting Issue
Yes, a votex and call it a day. Leave the brittle parts alone.
The 100mi tour is hot air expanding that is being tackled from under is the engine heat and the sun beating down on it as you ride an empty tank.
100mi = Pressure expanding pops the cap up. Pressure is able to push the fuel down and out the petcock = 100mi think.
1 mile or less = Vacuum is going to vapor lock the air you can't pull the cap up and that is no flow = Top off the tank and there is the least amount of air about to lock the flow even faster = 1mi or less.
How-to distinguish between a 2 and 3 fuel tank pipe nipple ends:
Use a long hose to blow in a nipple as you have the cap up and your ear/face close to the opening. Visually look at the first two pipe opening ends at the top of the tank filler opening.
1. Small tube: Looking down at the tank's recess well or the bottom of the neck. There is an-overflow hole. This is for washing/caught in rain/filled gas over the neck; drains to the ground.
2. Large tube: This is where the cap is still up, you see an oring around the filler neck someplace? Blow in the large nipple end and air should be sent out the hole around that oring.
3. Cali tube: This optional nipple sits up at the ceiling of the tank and captures vapor.
Tank venting ideas:
A. Horseshoe the weather vent tube to the large gas cap vent tube.. no air filtering unless you pencil strand out a cotton ball and shove it up the tube. Rain/wash water sits in that horseshoe and will be sucked in = High maintenance.
B. Run a hose from large tube up the tail end, zip-tie a cotton ball over the hose end for filtering.
C. Run the nipples open and let the liquids fall where it may. Zip-tie a cotton ball over the big nipple end(s).