Engine description Fuel diagram 1 Fuel tank 2 Fuel pre-filter 3 Fuel pump 4 Exchangeable fuel filter 5 Fuel supply line to the control block FCU (Fuel Control Unit) 6 Control block FCU (Fuel Control Unit) 7 High-pressure pump 8 Rail 9 Injector 10 Fuel return to fuel tank 18 © 2009 Fuel schematic (example) 3 3 TCD 2013 9 8 7 6 5 5 10 2 4 1 10 2