| I have never run a fuel sump on my -6A, but have 
filters between the tank and selector valve.  originally I choose 
inexpensive fabric(?) filament filters with the idea that I would simply replace 
them every annual.  one year I found fibers in the intake screen of the 
carb.  they are very difficult to see because they are basically clear, 
especially when wet with fuel.  so now I have the glass case metal screen 
filters, with I thought I'd could check before each flight, but admittedly 
don't.    kevin |