>There are several down sides to returning fuel to the sump (aggrivated
>quite a bit as the size of the sump decreases).  

Don't know where this comes from? My sump is only 1 gallon and contains two
fuel pumps. Never had an issue with fuel return to the sump in 520 hours now.
I had a minor problem at one time with sump vent placement. Had a potential
major problem once when I had the sump vent temporarily plugged - BIG NO-NO!

Perry