Injector water intrusion seal with blow out volume

A fluid injector (10') includes a housing (26) and an inlet tube (30) having a portion received in the housing (26). A primary seal (12) creates a seal between surfaces of the housing (26), the inlet tube (30), and an inlet (20) of the injector. A groove (38) is in the housing (26) and a secondary seal (18) is in the groove (38) to defining a seal between the housing (26) and a portion of the inlet (20) of the injector. A recessed portion (40) is defined in the housing (26) and is in communication with the groove (38). The recessed portion (40) defines a blow-out volume (42) such that when the primary seal (12) is leak tested, an indication of a leak of the primary seal (12) can be detected when the pressurized air moves past the primary seal (12) and forces a portion of the secondary seal (18) to an unsealed position into the blow-out volume (42).