Quote Originally Posted by Winnie View Post
Yeah makes sense... I did not see one when we did our install? Our second tank doesn't have one, but it is breathed to the main tank so could share?
Yep that's why there's a breather from main to aux. fuel from aux to main gets air from main to aux to replace space when transferring.

Must be on top of the main tank or sender or in the original filler further down mate.