RE: Fuel Filter
I've had and have a number of planes with 46AXs on them and when the area behind the engine was accessable (like the Calmato, TigerII, UltraStik40), I used a filter in the line for two purposes. Obvious one was to filter. The other purpose was for filling the fuel tank.
Those models had two line tanks, and the line to the filter/carb served as the fuel filler line. Having a filter in the line provided an excellent connection device. The filter has properly sized and "barbed" connections. With the appropriate size hose, there is no way the connection is going to come loose, and you inspect the hose every time you fuel the sucker. serendipity