a coupling for suspending a fuel injector from a fuel rail assembly of an internal combustion engine includes a collar that mates with the fuel injector and a retainer clip that engages with the collar thereby mechanically connecting the fuel injector to the fuel rail assembly . the retainer clip includes windows to enable even load distribution upon the socket flange when assembled . features are integrated in the collar to facilitate correct alignment of the injector relative to the fuel rail . paired together , the retainer clip and the collar enable a secure , and a keyed fuel injector - to - fuel rail connection that is able to withstand high pressure separating loads .