2012 SSANGYONG RODIUS fuel pump

03-24
2) Fuel System Flow Diagram
The fuel from the fuel tank is supplied to the fuel heater of fuel filter/priming pump and then low
pressure generated by the low pressure pump (built into HP pump) is transmitted to the HP pump.
The fuel pressure at the HP pump is controlled by the IMV valve, and the maximum allowed
pressure is 1,800 bar. The compressed fuel at the fuel pump is delivered to the rail, and injected
by the injectors according to the injection signals. The injection method is the same with the
conventional method; Fuel return by backleak which operates the needle valve.
The major difference is that the fuel return line is connected to the fuel filter inlet port, not the HP
pump venturi.
The pressure from the high pressure pump is increased to 1,800 bar from 1,600 bar, and the
pump is now installed to the cylinder head (cylinder block for previous model). The fuel pressure
is generated by the operation of intake camshaft and gears. The specifications for the IMV valve
and the fuel temperature sensor are not changed.

15-150000-00
(3) Fuel Pressure Control
Fuel pressure is controlled by IMV opening according to the calculated value by ECU.
Pressure in the fuel rail is determined according to engine speed and load on the engine. ▶
When engine speed and load are high
The degree of turbulence is very great and the fuel can be injected at very high pressure in order to
optimize combustion.
When engine speed and load are low
The degree of turbulence is low. If injection pressure is too high, the nozzle's penetration will be
excessive and part of the fuel will be sprayed directly onto the sides of the cylinder, causing
incomplete combustion. So there occurs smoke and damages engine durability. -
-
Fuel pressure is corrected according to air temperature, coolant temperature and atmospheric pressure
and to take account of the added ignition time caused by cold running or by high altitude driving. A
special pressure demand is necessary in order to obtain the additional flow required during starts. This
demand is determined according to injected fuel and coolant temperature.
Open loop determines the current which needs to be sent to the actuator in order to obtain the
flow demanded by the ECU. ▶
Closed loop will correct the current value depending on the difference between the pressure
demand and the pressure measured. ▶
If the pressure is lower than the demand, current is reduced so that the fuel sent to the high pressure
pump is increased.
If the pressure is higher than the demand, current is increased so that the fuel sent to the high
pressure pump is reduced. -
-Fuel Pressure ▶

03-32211-22
1. FUEL SYSTEM SPECIFICATION
Use Only Unleaded Fuel Rated at 89 Octane or Higher ▶
Fuel quality and additives contained in fuel have a significant effect on power output, drivability,
and life of theengine. Fuel with too low an octane number can cause engine knock.
Do Not Use Methanol ▶
Fuels containing methanol (wood alcohol) should not be used in vehicle.
This type of fuel can reduce vehicle performance and damage components of the fuel system.
Vehicle Fueling from Drums or Storage Containers ▶
For safety reasons (particularly when using noncommercial fueling systems) fuel containers,
pumps and hoses must be properly earthed. Static electricity build up can occur under certain
atmospheric and fuel flow conditions if unearthed hoses, particularly plastic, are fitted to the fuel-
dispensing pump.
It is therefore recommended that earthed pumps with integrally earthed hoses be used, and that
storage containers be properly earthed during all noncommercial fueling operations.

01-138410-02
▶Ef17, Ef18, Ef22, Ef24~Ef26, FUEL PUMP RELAY