Fuel cutoff valve

A fuel cutoff valve installed on a top of a fuel tank and adapted to open and close a conduit between the fuel tank interior and an outside passage depending on fuel level in the fuel tank, the fuel cutoff valve comprising:

• a casing having (i) a valve chamber that communicates with the fuel tank interior, (ii) an outside connecting passage and an inside connecting passage that respectively connect with the valve chamber and with the outside passage, (iii) a communication hole for introducing fuel into the valve chamber, and (iv) a vent hole situated above the communication hole;
• and
• a float mechanism having an outside float and an inside float that are housed within the valve chamber and that are respectively adapted to open and close the outside connecting passage and open and close the inside connecting passage by rising and falling depending on the fuel level;
• wherein the outside float has (i) a tubular shaped outside float body having a float chamber that connects with the valve chamber via a through-hole formed in an upper part of the outside float body, and (ii) an outside valve portion disposed on an upper part of the outside float body and adapted to open and close the outside connecting passage;
• and
• the inside float has (i) an inside float body accommodated within and adapted to rise and fall in the float chamber, and (ii) an inside valve portion disposed on an upper part of the inside float body and adapted to open and close the inside connecting passage through the through-hole.