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A fuel tank venting valve includes a housing defining a cylindrical chamber having a first plunger slidably mounted therein, and a spring biasing the first plunger in a closed position. The first plunger itself defining a cylindrical chamber having a second plunger slidably mounted therein, and a sp

A fuel tank venting valve includes a housing defining a cylindrical chamber having a first plunger slidably mounted therein, and a spring biasing the first plunger in a closed position. The first plunger itself defining a cylindrical chamber having a second plunger slidably mounted therein, and a spring biasing the second plunger in a closed position opposite to the closed position of the first plunger.

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1. A pressure differentiating two-way vent valve sized for press mounting within a vent hose extending from the filler neck associated with a vehicle's fuel tank, comprising: a generally cylindrical housing defined by a first section and a second section, said first and second sections being snap

1. A pressure differentiating two-way vent valve sized for press mounting within a vent hose extending from the filler neck associated with a vehicle's fuel tank, comprising: a generally cylindrical housing defined by a first section and a second section, said first and second sections being snap mounted together to define a first generally elongated cylindrical chamber, said second section further defining an inwardly directed first beveled landing and a contiguous inwardly directed second beveled landing within said chamber having a bevel angle greater than the bevel angle of said first beveled landing; said first chamber having a plurality of apertures extending through said housing into said first section's end and a singular aperture extending through said second section's end; a first elastomer plunger slidably mounted in said chamber in part defined by said second section and having an outwardly directed bevel flange portion form at one end of said first plunger matingly sized to said first bevel landing; said first elastomer plunger defining a second chamber open at said second chamber's ends extending generally centrally therethrough, said first elastomer plunger further defining an outwardly directed second beveled landing at a point along said second chamber; a second elastomer plunger slidably mounted in said second chamber, said second elastomer plunger having an outwardly directed bevel flange portion formed at a port therealong mating to and extending slightly beyond said second beveled landing; an elastomer end plate enclosing one end of said second chamber and having an aperture tgherethrough cocentric to said singular aperture of said second section; a first spring placed between and biased in compression by aid first section's end and said first plunger flange portion; and a second spring placed between and biased in compression said elastomer end plate and said flange of said second plunger.