Vapor separator tank

A vapor separator tank mounted on an outboard motor and separating gas from liquid fuel to be supplied to an internal combustion engine, the vapor separator tank comprising:

• a casing including a lower case and an upper case joined to each other and having a fuel storage compartment formed therein to store the liquid fuel;
• a pump pumping the liquid fuel stored in the fuel storage compartment;
• and
• a pressure regulator arranged in the fuel storage compartment and adjusting a discharge pressure of the pump to be constant, wherein
• the lower case is provided with a plurality of attachment portions attached to the internal combustion engine and drain piping for discharging the liquid fuel from the fuel storage compartment, and
• the lower case includes a first bottom surface portion including a lowermost surface, a second bottom surface portion formed in a position higher than the first bottom surface portion and supporting the pump, and a third bottom surface portion formed in a position higher than the first bottom surface portion and the second bottom surface portion.