NEXON

1.5L REVOTORQ ENGINE

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.