An engine fuel economizer device connected or connectable to establish an electrical path between an electrical system of an engine, preferably a d.c. battery and a starter motor or a charging alternator of an engine, preferably an internal combustion engine. The device, in one aspect thereof, includes a coil of conductive hollow tubing having a plurality of complete turns or loops formed therealong, is positionable over and around a section of fuel line which extends from a fuel tank to the engine. In another aspect of this disclosure, the coil device is prepositioned over and along a length of nonconductive tubing which is spliceable into the fuel line after a section of fuel line is sectioned and removed. Various additional aspects position the device in close proximity to the flow of fuel from the fuel tank to the engine.