A fuel injector (100, 300) for a gas turbine engine comprising: a) an inlet end portion (110, 310) for receiving fuel; b) an outlet end portion for issuing fuel into the gas turbine engine; c) an injector support body (114, 314) extending between the inlet end portion (110, 310) and the outlet end portion and having an interior bore (122, 322) extending therethrough; d) an elongated fuel tube (124, 224, 324, 424) disposed within the interior bore (122, 322) of the injector support body (114, 314) and having an inlet section (124a, 324a, 424a) operatively associated with the inlet end portion (110, 310) of the fuel injector (100, 300) and an outlet section (124b, 324b) operatively associated with the outlet end portion of the fuel injector (100, 300), wherein adapter means (128, 228, 328) are associated with one of the inlet section (124a, 324a) of the fuel tube (124, 224) and a reception bore means (320, 420) of the inlet end portion of the fuel injector for retaining at least one sealing member (130, 230a, 230b, 330, 430); and e) an annular seal retention channel (132, 232a, 232b, 332, 422) formed in the adapter means (128, 228, 328) between two axially spaced apart annular flanges (134, 136; 234, 236; 334, 336; 434, 436), wherein the at least one sealing member is an annular sealing member that is retained in the annular seal retention channel (132, 232a, 232b, 332, 432) formed in the adapter means, characterised by each annular flange (134, 136; 234, 236; 334, 336; 434, 436) including a first annular flange portion (134a, 136a; 234a, 236a; 334a, 336a; 434a, 436a) adjacent the annular seal retention channel and a second annular flange portion (134b, 136b; 234b, 236b; 334b, 336b; 434b, 436b) axially spaced from the first annular flange portion, wherein a groove (134c, 136c; 234c, 236c; 334c, 336c; 434c, 436c) is defined between the first and second annular flange portions of each annular flange, and wherein the first annular flange portion of each annular flange has a reduced diameter with respect to the second annular flange portion of each annular flange. a) an inlet end portion (110, 310) for receiving fuel; b) an outlet end portion for issuing fuel into the gas turbine engine; c) an injector support body (114, 314) extending between the inlet end portion (110, 310) and the outlet end portion and having an interior bore (122, 322) extending therethrough; d) an elongated fuel tube (124, 224, 324, 424) disposed within the interior bore (122, 322) of the injector support body (114, 314) and having an inlet section (124a, 324a, 424a) operatively associated with the inlet end portion (110, 310) of the fuel injector (100, 300) and an outlet section (124b, 324b) operatively associated with the outlet end portion of the fuel injector (100, 300), wherein adapter means (128, 228, 328) are associated with one of the inlet section (124a, 324a) of the fuel tube (124, 224) and a reception bore means (320, 420) of the inlet end portion of the fuel injector for retaining at least one sealing member (130, 230a, 230b, 330, 430); and e) an annular seal retention channel (132, 232a, 232b, 332, 422) formed in the adapter means (128, 228, 328) between two axially spaced apart annular flanges (134, 136; 234, 236; 334, 336; 434, 436), wherein the at least one sealing member is an annular sealing member that is retained in the annular seal retention channel (132, 232a, 232b, 332, 432) formed in the adapter means,