A fill adapter system for transferring fluid from a fluid vial into a reservoir of an infusion pump assembly, wherein the reservoir is for receiving infusible fluid, and the infusion pump assembly comprises a plurality of ribs (964, 966, 968) which can be displaced into the reservoir, the fill adapter system comprising: a reusable fill adapter base, the base comprising: a volume control mechanism (1014, 1016, 1018, 1110, 1112, 1114, 2702,2704), comprising a turn dial and a push plate, the push plate comprising one or more button assemblies corresponding to and aligned with the ribs (964, 966, 968), wherein the turn dial actuates the push plate so that the one or more button assemblies displace at least one of the plurality of ribs (964, 966, 968) to adjust an available fill volume of the reservoir (108,908) of the infusion pump assembly; and a pump mechanism configured to pump air into the fluid vial; and a vial adapter assembly comprising: a first needle (2720,2756a) fluidly coupled to the pump mechanism and configured to penetrate a septum of the fluid vial for fluidly coupling the pump mechanism to the fluid vial; a second needle (2724, 2756b) having a first end configured to penetrate the septum of the fluid vial and a second end configured to penetrate a septum of the reservoir of the infusion pump assembly to allow transfer of fluid from the fluid vial to the reservoir of the infusion pump assembly in response to air being pumped into the fluid vial; and a needle carriage (2732a,2754) adapted to carry the first needle (2720,2756a) and the second needle (2724,2756b), wherein the needle carriage is slidably attached to the interior of the vial adapter assembly, wherein the needle carriage is adapted to slide from a vial end of the vial adapter assembly to a receptacle end of the vial adapter assembly. a reusable fill adapter base, the base comprising: a volume control mechanism (1014, 1016, 1018, 1110, 1112, 1114, 2702,2704), comprising a turn dial and a push plate, the push plate comprising one or more button assemblies corresponding to and aligned with the ribs (964, 966, 968), wherein the turn dial actuates the push plate so that the one or more button assemblies displace at least one of the plurality of ribs (964, 966, 968) to adjust an available fill volume of the reservoir (108,908) of the infusion pump assembly; and a pump mechanism configured to pump air into the fluid vial; and a volume control mechanism (1014, 1016, 1018, 1110, 1112, 1114, 2702,2704), comprising a turn dial and a push plate, the push plate comprising one or more button assemblies corresponding to and aligned with the ribs (964, 966, 968), wherein the turn dial actuates the push plate so that the one or more button assemblies displace at least one of the plurality of ribs (964, 966, 968) to adjust an available fill volume of the reservoir (108,908) of the infusion pump assembly; and a pump mechanism configured to pump air into the fluid vial; and a vial adapter assembly comprising: a first needle (2720,2756a) fluidly coupled to the pump mechanism and configured to penetrate a septum of the fluid vial for fluidly coupling the pump mechanism to the fluid vial; a second needle (2724, 2756b) having a first end configured to penetrate the septum of the fluid vial and a second end configured to penetrate a septum of the reservoir of the infusion pump assembly to allow transfer of fluid from the fluid vial to the reservoir of the infusion pump assembly in response to air being pumped into the fluid vial; and a needle carriage (2732a,2754) adapted to carry the first needle (2720,2756a) and the second needle (2724,2756b), wherein the needle carriage is slidably attached to the interior of the vial adapter assembly, wherein the needle carriage is adapted to slide from a vial end of the vial adapter assembly to a receptacle end of the vial adapter assembly. a first needle (2720,2756a) fluidly coupled to the pump mechanism and configured to penetrate a septum of the fluid vial for fluidly coupling the pump mechanism to the fluid vial; a second needle (2724, 2756b) having a first end configured to penetrate the septum of the fluid vial and a second end configured to penetrate a septum of the reservoir of the infusion pump assembly to allow transfer of fluid from the fluid vial to the reservoir of the infusion pump assembly in response to air being pumped into the fluid vial; and a needle carriage (2732a,2754) adapted to carry the first needle (2720,2756a) and the second needle (2724,2756b), wherein the needle carriage is slidably attached to the interior of the vial adapter assembly, wherein the needle carriage is adapted to slide from a vial end of the vial adapter assembly to a receptacle end of the vial adapter assembly.