A fuel injector is described that includes a polymeric housing, pole piece, filter assembly, coil assembly, spring member, armature assembly and metering assembly. The polymeric housing has a passageway extending between an inlet and an outlet along a longitudinal axis. The pole piece is disposed in the passageway, the pole piece having a through opening. The filter assembly has a portion disposed in the through opening of the pole piece. The coil assembly is disposed in the polymeric housing to surround the pole piece. The spring member is disposed partly in the pole piece and including a spring portion contiguous with the portion of the filter assembly. The armature assembly is disposed in the passageway in a first position having a first portion confronting the pole piece and in a second position having a closure member contiguous to an end face of the pole piece. The metering assembly is secured to the polymeric housing proximate the outlet. The metering assembly has a seat secured to a polymeric support member. The seat has a sealing member disposed between the seat and the polymeric support member. A method of sealing a fuel injector is described.