David Paule retired after 30 years of structural analysis and is now building an RV-3B to keep from getting bored. The structural engineering included a mix of aircraft and spacecraft. He has been a private pilot since age 18 and currently owns and flies a Cessna 180.
Simplicity is key in a good fuel system, but there's a lot to consider when creating even an uncomplicated setup, from primers to sniffle valves to gascolators.