Oxygenated fuel storage

I use the same hose and feel like the seal is a bit better with the cap

If it’s oxygenated I’d seal with the original cap. 

It doesn't really matter since the smell will get through.  Plus, the bike will stink as well.

That said,  those hoses deteriorate with oxy fuel and get brittle and will crack.  Problem is, you take that hose off and it still stinks.

The ethers in the fuel are pretty stable, but its still best to run through these fuels asap.