Relations Between Pressure And Temperature In Fuel Transfer Line - SSANGYONG 2004 Rexton 2.7XDi Workshop Manual

Priming Pump
If fuel runs out during driving or air gets into fuel line after fuel
filter replacement, it may cause poor engine starting or dam-
age to each component. Therefore, the hand priming pump is
installed to fill filter.
When the vehicle is under the conditions as below, press the
priming pump until it becomes rigid before starting the engine.
Conditions for using Priming Pump
- After run out of fuel
- After draining the water from fuel filter
- After replacing the fuel filter
Notice
When the fuel filter is replaced, the fuel in the fuel tank should be transferred to the filter by using priming
pump. So never transfer the fuel in the fuel tank to the filter by driving HP pump with cranking the engine.

Relations Between Pressure and Temperature In Fuel Transfer Line

Pump inlet pressure
Fuel transfer
line
Pump outlet pressure
• The fuel transfer line is the line between fuel tank and HP pump inlet port. The pressure on this line affects the
lifetime of fuel filter.
• Temperature of fuel transfer line
- HP pump inlet temperature is less than 80°C.
- The temperature of fuel pump inlet is up to 80°C.
And, diesel fuel has lubrication effects due to its viscosity. Thus, the fuel is also used for pump lubrication.
However, this lubrication performance drops as the temperature rises. Accordingly, when the fuel temperature is
over 50°C, 100% of fuel is returned to fuel tank to cool down the temperature and then increase the lubrication
effects of fuel and prevent heat damage on each section of high fuel pressure line.
FUEL SYSTEM
DI ENG SM - 2004.4
Pump
Ventury
Injector No.1 return pressure
to fuel filter
from fuel tank
High pressure common rail
Injector
Injector No.5 return pressure
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
DI07-41
Y220_07086
Y220_07087