Two-stage fuel tank isolation valve with integrated in-line pressure relief

A fuel tank isolation valve is provided. The valve includes a valve assembly disposed within a valve chamber defined by a housing, and a solenoid assembly including a moveable plunger. A first stage poppet is fixed to and extends from the moveable plunger. The valve assembly includes a head, a central body, a sleeve, and a retainer. The sleeve includes a first stage valve seat. The first stage poppet extends through the retainer and is seated on the first stage valve seat in a closed disposition. The head includes a second stage valve surface that is seated on a second stage valve seat surrounding a transfer passage formed in the housing. In a first stage open disposition, the first stage poppet is unseated from the first stage valve seat, while in a second stage open disposition, the second stage valve surface is unseated from the second stage valve seat.