NEXON BSVI MCE - SERVICE MANUAL

1.5L REVOTORQ BS VI ENGINE 93 B. HP PUMP The High pressure pump delivers in each operating point the required fuel amount and controls the rail pressure according to the demand of the ECU. HP pumps draws fuel from the fuel tank through the water Sedimentor and the fuel filter. It supplies high pressure fuel (up to 1600 bar) to the injectors. It has got inlet metering valve and in-built feed pump, integrated pressure limiter and integrated fuel temperature sensor. This pump is driven by the engine timing belt and controlled by EMS ECU based on the various operating parameters. C. FUEL RAIL It is a fuel reservoir where the fuel is maintained at a pressure of about 1600 bar. The fuel is pumped into it from the HP pump and gets delivered to the injectors through the HP lines. It is also fitted with a high pressure sensor and the signal is used by EMS ECU to maintain the fuel pressure. NOTE Whenever fuel rail is removed from the engine, always cover the inlet and outlet openings of the rail with the protective caps. D. MAIN FUEL-FILTER The Fuel filter is fitted as a second filtering step in the fuel feed system. It is mainly used to filter out particles that are present in the fuel. This fuel filter is equipped with clogging sensor, which is used to determine the life of filter. E. PRIMING PUMP Priming pump is provided in the low pressure line just before the fuel filter. It is used to prime the fuel feed system with fuel. This is done in order to avoid air lock in the system. The advantage is that the fuel lines need not be loosened or dis- connected to bleed the system. Priming can be done by pressing and releasing the bulge repeatedly till it is filled with fuel.