Sean,
When I used the term "hard tubing" it was meant to be synonomous with Brass or Aluminum tubing. When you menioned hard tubing, I think you meant polyurethane flexible (tubing) hose. I don't agree with the use of Tygon F-4040A hose in a Festo type fitting either, as it does not fit properly, and is too small in bore size to feed a large engine fuel flow requirement properly anyway. The suction side of the system will siphon better through the lower resriction 6 MM hose.


6MM hose is .1582 bore (4 MM). Tygon F4040A hose is .250 O.D., .065 wall, leaving a bore diameter of .120 (that's less than 1/8", a full .0382 smaller than 6 MM polyurethane!)
Since the 6 MM polyurethane hose, as supplied with the BVM UAT, is a full 25% larger in bore diameter, would you rather use the 6 MM polyurethane hose, or the smaller (Tygon) hose?

Harley Condra
BVM REP
JetCat REP