The O-Ring is not the issue. I replaced mine with Harley provided ones with no effect.
The issue is the factory swaged swivvel.
With cool weather, my swivvel dumped a cup of gas a minute this morning. I cut it off and replaced it with a 3/8-in IPS x 1/4 barb and hose clamp. The 3/8 IPS leaks even with 10 wraps Teflon but only a few drips a minute. The experiment shows the complex cone with O-Ring arrangement is a decoy and unneccessary. The threaded part is a very obscure METRIC M18X1.5, even in Canada I bet. M18 is rare and 1.5 is the even more obscure fine thread version. The good news is the M18X1.5 is designed to be liquid tight without any teflon or thread compound. I'll believe it when I see it. I've asked a machine shop to make up the part, an M18X1.5 to 1/4" barb adapter. It will even have the 7mm injector test port on the bottom. If this works out, I will make 50 or so and provide them to poor suckers like us at a reasonable price so we can ride without risking our lives and poluting the air.
One last point. I am convinced this part is totally contrived to make after sale profits. The (EDIT) is, if any of us have trouble going to Sturigis or similar trips, we are gonna be sidelined way longer than neccessary. M18X1.5 coulda so easily been a common 3/8". My temporary fix cost $7. The lowest price I've found anywhere is over $150.