1998 Johnson Evinrude "EC" 150, 175 FFI Service Manual, P/N 520211, Page 39Get this manual
Each rail has two sectionsThey can be disassembled for service by releasing clipeither at the top or bottom of each railA single crossover hose links the bottoms of the supply rails; similarly, single hose connects the tops of the return rails wire retainer spans each injector to connect the inlet and outlet rail fittingsThe retainer securely holds both fittings to the injector to prevent them from accidentally disengaging Cylinder Heads
[] Each head mounts one fuel injector and one spark plug per cylinderTheir positioning is designed to permit complete combustion and maximum power from each airfuel chargeThis results in greatly reduced exhaust emissions and increased fuel economy[] Each head also features temperaturepressure thermostatIt's located at the top of the head in the water passage coming from the cylinder blockIt can be opened either by water tempera ture or by water pressureThe heads also mount the water temperature switch and water temperature sensorThe switch is in the starboard head, while the sensor is in the port headPistons