Followed plans without much thought about separate fuel filters.

I usually do my own fueling from 5 gal. cans and airplane is stored in a hangar year round.  Normally have replaced the single filter annually during normal maintenance.  The clear plastic filters allow pre-flight inspection.  The quick drains have caused more problems - a small piece of grit/dirt will interfere with the spring loaded seal and have a tendency to leak.

I did install a shut-off valve on the tank discharge line so each tank could be isolated.  It is safety wired in the "OPEN" position and operated annually.

Additionally, I installed an electric fuel pump and spliced in a fuel pressure gauge line at the top of the engine (Rotax 912ULS) and routed line to gauge in panel.  Along with that, I added a vent line from the existing fuel split at the top of the engine and ran a nylon line back to the fuel tank - used PVC drip irrigation fittings to make 90 degree bends - the line is on the pilot side and the air bubbles can be seen going back to the tank.

Have been operating since 2010, approx. 200 hours, the system has been running successfully.  Annual maintenance and inspection are important for this system.