With a foreword facing vent you have a ram air effect which pressurizes the tank slightly. With the tank being full the fuel gets to sloshing and when it contacts the vent port, it unloads. I had that happen on a Aircoupe while I was a passenger once. We were buzzing a barn at a friends place and gas came out all over the wind screen. That main tank should be vented.
-Joe Scappoose Ore. > > I am test flying a newly purchased Tri Q2. On rollout fuel > started venting all over the canopy, lots of fuel. It has a > forward facing vent on top of the header tank close to the > canopy. The header tank guage showed about an inch from > being full. The main fuel tank cap is not vented. There is > a quarter turn shut off valve from the header to the main > tank which seems to drain fuel from header to main. It > didn't seem to matter which way it was set. Also didn't seem > to matter whether the fuel pump was on or off. Any ideas on > what is causing this? > Mitch Hargin > N311DM Tri Q2 > VW 2600 > Clarinda, IA >
