Apparatus for controlling shut-off of fuel gun in filler pipe of fuel tank

An apparatus for controlling shut-off of a fuel gun in a filler pipe of a fuel tank, the apparatus comprising:

• a retainer mounted in a filler neck of the fuel tank, and including:
• external air intake holes configured to draw external air,
• evaporation gas venting holes configured to discharge fuel evaporation gas, wherein the external air intake holes and the evaporation gas venting holes are formed in an upper portion of the retainer in a fuel injection direction of the filler neck, and
• an opening formed in a lower portion of the retainer, disposed outside a fuel discharge part of the fuel gun inserted into the filler neck, and configured to fluidly communicate with the external air intake holes and open a venturi port of the fuel discharge part;
• a partition disposed in a space between an inner circumferential surface of the filler neck and an outer circumferential surface of the retainer and having a fuel intake hole formed in a lower end of the partition, wherein the partition is configured to define a first space where the opening and the external air intake holes are fluidly communicate to each other;
• and
• an early shut-off prevention valve disposed in the partition and configured to:
• close the fuel intake hole before the fuel tank is fully filled with fuel, and
• open the fuel intake hole by fuel flowing to the filler neck from the fuel tank when the fuel tank is fully filled with the fuel.