Venting Fuel From Main Tank

[genelinfante]

Bought a Skybolt in February this year. Didn't use the top wing tank until 2 weeks ago. With the Aux Tank selected with the fuel selector valve, it appears I'm forcing fuel out of the main tank through one of the vents. Lost about 10 gallons from the main tank while running on the aux tank for 40 minutes. No fuel venting/leaking issues with the main tank selected. Any ideas?

 

[Guido Lepore]

 

[Neil]

 

[genelinfante]

 

[MTChris]

 

[Er_c]

 

[PittsDriver68]