Quote Originally Posted by martymayes View Post
Looks like this was addressed in SH Service Bulletin #131

http://glasairaviation.com/wp-conten.../07/GSB131.pdf
Thanks for pointing this out - good find that seems to directly address the OP's issue.

As an Aeronautical Engineer who's had some exposure to designing complex fuel systems for aircraft (WKII, etc.), I will say that to _ME_, this fuel system design is flawed. The earth is not everywhere flat, and the notion that the pilot is responsible for finding a spot to park where (assuming the aircraft was built perfectly straight and level in the first place, which is a big assumption and possibly in this case not true) one wingtip is not higher than the vent on the other wingtip is just bad design practice. Split the tank, have a L/R/Header/Off valve, and call it good.

My $0.02.