Sindres RV-14A

I used a tube with water to get approx 1 psi of pressure (1 psi = 27 inches of water). At the first the pressure decreased slightly, but after taping the fuel filler cap and tightening the hose clamps it looked good. I let it stay overnight, and the column had only decreased 20 mm. But the atmospheric pressure had increased 2 hPa at the same time frame. So I considered it as a success😊 I also noticed that the pressure in the tank is very sensitive to temperature. As I started working in the shop and the temperature increased a bit, the water column climbed up some 15-20 mm quite fast.

  The left side fuel tank is now complete and closed with the tank baffle. I've not installed the tank baffle on the right tank, because I want to do leak test on the left one first. The tank sealant cures slowly, so to be sure I will wait a week before doing the pressure test. Hopefully I'm good - if not it might be challenging to fix eventual leaks.  Vans di just publish a video on how to build the fuel tanks. That was very helpful, and I followed the directions closely.  Resistance at empty. Resistance on full. I had to buy one more tool to flare aluminum vent lines. Rolo-Flare flaring tool 37° from Aircraft Spruce .