Fuel tank filler necks

[Big Ed]

Anyone have any tips on how to finish the fabric here? I travel sometimes and aircraft gets rained on, so I would like that area to be watertight.

 

[Bob Turner]

I will look. Mine was done by an expert.
Super Cubs have a rubber doily - we think it is a John Deere part. It can easily be duplicated with a sheet of fuel-resistant rubber. Just make the hole slightly smaller than the filler neck.

 

[Hiperbiper]

Anyone have any tips on how to finish the fabric here? I travel sometimes and aircraft gets rained on, so I would like that area to be watertight.

The wing tanks on the Champ have the fabric extending up the filler neck, glued and a band clamp over that...

Another possibility is a cockpit cover from Bruce's Custom Covers. They make a nice one that covers the windshield, skylight and extends out to cover the gas caps. Waterproof, lined and wide straps.
Chris

 

[Big Ed]

Answer posted by Dale from ACA on FB. Note a solid ring shaped patch goes on top of the serrated tape.