Interface for fuel delivery system for combustion fastener driver

A fuel delivery system constructed and arranged for use with a combustion fastener driver including a cylinder head frame, a combustion chamber, and a housing defining a fuel cell chamber, said fuel delivery system comprising:

• a fuel cell with an outer shell having a closed lower end and an open upper end;
• a closure crimped over said upper end and defining an opening sized to accommodate a reciprocatable valve stem;
• a fuel cell adapter frictionally engaged to said closure and including a flange configured to suspend said fuel cell in the fuel cell chamber, said fuel cell adapter including a collar defining an opening sized to receive said valve stem, wherein the collar is suspended for restricted vertical movement relative to said flange;
• and
• a stem receiver block connectable to the cylinder head frame and including a stem engagement portion configured to directly and sealingly engage an end of said valve stem, said stem engagement portion being in fluid communication with an internal receiver passage constructed and arranged to deliver fuel to the combustion chamber.