I’m happy that after the fuel cap fix the tank passed the leak test.
This is the graph of the leak test:
You can see that there’s a delay when the temperature changes. The reason for that is that I measure the temperature outside of the tank and not in the tank.
Leak rate is around 10-4 10-5 mbar*ls which means the tank is gasoline tight.
See Fuel tank leak test for more info.