Abstract: A fuel tank cap including a vapor storage receptacle and a discriminator that discriminates between liquid fuel and fuel vapor for protecting the vapor storage receptacle from liquid and adsorbent granulated carbonaceous material. A fuel storage system including a fuel tank cap having a vapor storage receptacle is also disclosed.

Abstract: A small engine fuel system includes a vent valve configured to be disposed within a tank having at least a portion of a filler pipe defined therein. The filler pipe includes an upper portion configured to receive a fluid and a lower portion located at a predetermined depth in the tank, where the predetermined depth defines a liquid fill level of the tank. The small engine fuel system further includes spring valve arranged in series with the vent valve. The spring valve is configured to close during a refilling event, thereby substantially preventing overfill of the tank with the fluid.

Abstract: A small engine fuel tank vapor emission system is described with a separate surge tank having a vapor vent/rollover valve and separate a vapor storage space which may be found in a common housing or remote from the surge tank. The surge tank is located at a level above the fuel tank and is connected to have its inlet receive vapor from the fuel tank. The outlet of the vapor vent/rollover valve is connected to supply vapor purge flow to the engine air inlet either directly or through the storage space, which may be charged with adsorbent.