Reconditioned Fuel Pumps of ALL Makes
Specialist Fuel Injection Repair
ECU Repair and Installation
Injector (Common Rail)
Air Conditioning Service
Each pumping plunger moves up and down under the action of the engine camshaft via a rocking lever and a plunger return spring. On the upward (filling) stroke, fuel at feed pressure enters the chamber below the plunger via the cylinder head fuel feed passage, non return valve, fuel passage 'A', the open spill control valve and fuel passage 'B'. During the downward (pumping) stroke, except for the period that the spill control valve is closed to enable injection, fuel passage 'A' and the cylinder head fuel feed passage.
When the stator is energised, it attracts the armature, and thus the spill controll valve, which closes. Fuel pressure then increases and fuel passes via the fuel passage 'C' to the injector nozzle.The nozzle opens and fuel is sprayed into the combustion chamber. When the stator is de-
Injection timing and fuel quantity are determined by the relationship between the plunger position and the electrical signal supplied to the stator by the ECU.
Electronic Pilot Injection/2 Stage Lift VCO Nozzle
The EUI (Electronic Unit Injector) features a combination of electronic pilot injection with a two stage lift VCO (Valve Covering Orifice) type nozzle to further optimise and refine the injectors performance on engine.
The use of pilot injection allows the EUI to deliver a small amount of fuel at a pre-
The pilot injection feature is complemented bya two stage lift VCO type nozzle. This assembly is mechanically set to lift at pre-
The fuel injection pump and injector are combined in a single unit. The EUIs (Electronic Unit Injectors) are situated in the cylinder head above the combustion chamber, with the pumping plungers driven by the engine camshaft via rocking levers. Fuel feed and vent are through passages in the cylinder head.
Sensors provide information to the ECU (Electronic Control Unit) on the relevant engine operating parameters which are typically:
accelerator pedal position
engine speed and timing
This information is continuously compared with the optimum values stored in the ECU'S memory. The result of that comparison is translated into signals instrcting the unit injector solenoid-
Pressure Assisted Nozzle Closure
The EUI (Electronic Unit Injector) has a unique patented feature which has been developed to hydraulically assist the nozzle valve to close upon injection termination. This utilises the injector spill energy to provide additional force to close the valve faster than is possible with the nozzle springs acting alone. This feature ensures a very rapid termination of injection which further reduces engine emission levels. When the EUI is injecting fuel, the nozzle valve moves to its full lift stop awaiting the signal to terminate injection. To commence termination, the stator is de-