Fuel-delivery control system

A fuel-delivery control system for a fuel tank, the system comprising

• a housing module formed to include a fuel-delivery channel, and
• a check valve assembly positioned to lie in the fuel-delivery channel, the check valve assembly including a support base appended to the housing module and formed to include a guide passageway, a valve member including a guide stem extending into the guide passageway for axial movement therein along a longitudinal axis and a closure member appended to the guide stem for axial movement with the guide stem along the longitudinal axis between a channel-closing position engaging the housing module and a channel-opening position disengaging the housing module, said guide stem moving in said guide passageway as said closure member moves between said channel-opening position and channel-closing positions, and a spring yieldably urging the valve member toward its channel-closing position, the support base including a spring mount engaging one end of the spring and a stop flange, the valve member further including means for engaging the stop flange to limit axial movement of the valve member relative to the support base in a channel-opening direction.