Component description Fuel circuit diagram – Engine running Injection pump 6 6 Pressure chamber Suction chamber Flame starting system 3 T UV Injection nozzles 11 11 Fi Fp 10 4 4 7 Engine 9 9 9 9 5 13 M 2 8 12 1 1 Fuel tank 7 Overflow valve 3.7–4.3 bar 2 Prefilter 8 Pre-delivery pump (hand primer) 3 Electrohydraulic shut-off device (EHAB) 9 Fuel hose NW12 (overrevving protection) 10 Magneto valve 4 Delivery pump (double acting) 11 Flame heater plugs 5 Fuel filter 12 Electric fuel pump 6 Overflow valve 2.0–2.5 bar 13 Overflow valve 1.0 bar Caution: Presupply pump integration in the fuel circuit should be checked according to pump type. 14