HEXA

ENGINE

Fuel System Priming Procedure :

If the performance of the engine is affected due to

the presence of the air in fuel system (commonly

known as air lock), then detect can be removed by

bleeding the fuel system. This can be done by

pumping the priming pump by hand.

Start engine and check for fuel leakage. Rectify if

necessary.

Check for smooth running of engine.

Whenever replacing fuel sedimentor or filter, use

priming pump to complete the fuel flow circuit.

NOTE



Do not loosen the HP lines for bleeding the

air from fuel system. Bleeding of the fuel

system should be done only using priming

pump.

d) Common 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 rail pressure

(RP)

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.

e) Injector :

The injector used in VARICOR engine is a

solenoid operated injector. This is controlled by

the EMS ECU. The timing of injection and quantity

is controlled by the EMS ECU. It operates at a

pressure of 1600 bar. It makes multiple injections

(

2 pilot injections and 1 main injection)

with short

intervals between each injection.

The injector has a unique 20 digit hexadecimal

I3C code by which the EMS ECU recognizes it.

Whenever an injector is replaced, it should be re-

calibrated using the Diagnostic tool by entering

the I3C code.

For procedure refer EMS ECU

Diagnostic software users’ manual in this group.

NOTE



Injectors should not to be interchanged in

during service since individual injector

characterization is different and I3C no. of

each injector is written in the ECU during

engine assembly.