[Chris Burkard]

I believe your 29 has only one fuel tank. 196 gallons if my memory serves me well. I do however believe that Tiara set the tank up with two fills (one port and one starboard) so the vessel can be filled from either side without having to drag the hose across the boat. If this is the case, you should have a vent on each side of the boat for the fuel tank. You will also have two other vents, one for the fresh water tank and one for the holding tank.

It is not unusual during the heat of the day to have fuel vapors emanating from the vents. As the tank heats up, the air inside the tank expands and forces the fumes out of the vents. A full tank will mitigate this as there will be less air to expand inside the tank. The fuel can expand, but not nearly at the rate of the air. This expansion and contraction can lead to water in the fuel (through condensation) if the vessel sits for long periods of time over the hotter and more humid months. Add a fuel additive if you don't operate your vessel at least weekly during the summer.

Good luck!