Dec 16, 2007     Fuel tank testing - a wise move       Category: Fuel System

We were warned that the welded aluminum might not be totaly leak-proof. So, we tested them for leaks using a gallon jug of 99% isopropyll alcohol. We tinted the alcohol with ??

  Dec 16, 2006     The four fuel tanks we tested for leaks - and found several! - (10 hours)       Category: Fuel System

The welded aluminum fuel tanks we didn't trust, so we leak tested them using 99% isopropyl alcohol spiked with dye.

  Dec 16, 2006     Fuel tank venting system - (20 hours)       Category: Fuel System

The fuel tank venting system uses dual nylaflo tubing running out the wing to the wingtip. There an ingenious system utilizing a one-way spring valve keeps fuel from dribbling out in all the most extreme conditions and vent the 4 fuel tanks to the atmosphere.

  Mar 19, 2006     Main and aux fuel tank system with transfer pumps - (50 hours)       Category: Fuel System

The Sportsman fuel system uses two 15-gallon main tanks next to the inboard end of each wing, and two aux tanks just inboard of the wingtips. Dual Facet fuel pumps with 3/8" aluminum fuel tubing connects the aux tanks to the mains. The mains feed the header tanks through rubber fuel hose. In addition, a rather complicated venting system using 1/4" nylon tubing allows the tanks to breathe but not drain the fuel in most situations.

We used Swageloc fittings in most connections in the wing fuel system.