Gene,

 

A couple comments on the vent lines.  My super fastbuild has 3/8" vent lines, but the original ESs had 1/4".  I found this out AFTER building my wingtips with the 1/4" tubing per the manual.  There was also an SB on the original tubing used in the vent lines.

 

I had a IV in my hangar for some interior work that had a wing tank fuel leak.  I had to drain the tank and wasn't sure I could keep up with the flow after taking out the quick drain.  So I put a piece of duct tape over the NACA.  The fuel practically stopped flowing after less than 1 gallon.  That's with 35 gallons of head pressure.  I'm thinking that a clogged vent would be impossible to overcome with the boost pump.

 

If it was me, I think I'd do some more searching, very mysterious.

 

Mike