Schematic diagram of fuel system for D 2840 LE 403 and D 2842 LE 404 engines 1 2 3 4 5 6 8 9 10 7 1 Fuel filter 6 Leakage fuel from injection nozzles 2 Injection pump 7 Delivery pump 3 Electro-hydraulic cutout (EHAB) 8 Fuel supply from tank 4 Fuel return to tank 9 Hand primer with prefilter 5 Overflow valve 10 Bypass with overflow valve * * When the engine is turned off by means of the electro-hydraulic cutout (emergency stop), the direction of fuel flow is switched so that fuel is returned from the suction gallery of the injection pump to the fuel tank. In this case the bypass serves to bypass the hand primer through which fuel can flow in one direc- tion only. 24