An onboard fire suppression system for an automotive vehicle includes at least one reservoir containing a fire suppressant agent, and a propellant device for evacuating the fire suppressant agent from the reservoir. The propellant device is located within the reservoir. An electrically powered initiator, operatively connected with the propellant device, initiates a discharge of gas from the propellant device. The initiator is energized by an initiator conductor which is housed within an axially compliant conduit which extends through at least one wall of the reservoir, and which defines an enclosed pathway from the exterior of the reservoir to the initiator. The axial compliance of the conduit permits weldless use of the conduit with a composite reservoir.