Abstract: A fuel tank cap including a vapor storage receptacle and a means for protecting the vapor storage receptacle from liquid and absorbent 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 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.