I had an interesting experience on my ES wings.  I had the super fastbuild wings where everything except closing was done for me.  My wings passed the pressure test.  I put a couple gallons of fuel in each wing before attaching them to the fuselage for the last time.  I sloshed back and forth, up and down and then dumped the fuel out.  Then we installed the wings.  The next day I noticed a wet area around the fuel drains on both wings.  Leaks!  It ended up that the fuel drains (which were installed by the factory) were just hand tight with no sealant on the threads.  How I passed the leak test I'll never know.  I removed both drains, sealed the threads and reinstalled.  You might want to check yours if yours came preinstalled.

 

Mike Easley

Colorado Springs