Fuel vapor storage canister

摘要

A fuel vapor storage canister (10) including a mass of carbon granules (22) in a carbon bed chamber (20A,20B) of the canister, a liquid trap (34) having a polygonal internal chamber (44) between a vapor inlet port (48) and the carbon bed chamber, and a purge duct (66) traversing the polygonal chamber. The polygonal chamber includes a plurality of three sides (42,36B,36A) which define the gravitational bottom of the chamber in respective ones of a plurality of three orientations of the vapor storage canister. A pick-up tube (70) in the polygonal internal chamber has an outboard end (72) at the convergence of the aforesaid plurality of three sides (42,36B,36A) and an inboard end (74) surrounding an orifice (76) in the vapor purge duct. The inboard end of the pick-up tube is vertically above the maximum level of liquid fuel in the polygonal internal chamber in each of the aforesaid plurality of three orientations of the vapor storage canister. A pressure gradient between the vapor purge duct and the polygonal internal chamber induces liquid fuel to flow through the pick-up tube and the metering orifice into the vapor purge duct. <IMAGE>