Operation & Maintenance Manual for WP7 Euro
Ⅵ
Vehicle Diesel Engine
12
3 Common failures and Troubleshooting
3.1 The engine fails in starting
Causes
Troubleshooting
1. Fuel pipe is blocked
Check and remove the blockage and check if the
fuel is clean
2. There is air in the fuel system
Release the air and check air tightness of joints
3. High pressure fuel pipe is damaged
and fuel leaks out
Repair it or replace it with a new one
4. The ambient temperature is too low Use auxiliary start device
5. There is few fuel or no fuel left in
the tank
Check and refuel
3.2 The engine stops soon after starting
Causes
Troubleshooting
1.
Fuel filter is blocked
Disassemble the filter to clean and dry the inside;
or replace it if necessary
2. There is air in the fuel system
Check the tightness of fuel pipes and the joints;
check if the bleed screw is tightened; release the
air
3. Fuel is of poor quality, containing
too much water
Wash the filter and use high quality fuel
3.3 Engine Power is insufficient
Causes
Troubleshooting
1. Air inlet pipe is blocked (air filter
is blocked)
Check and clean the air filter and air inlet pipe or
replace the element
2. Exhaust back pressure is high
Check if the exhaust pipe is blocked
3. The pressure of turbocharging
system is insufficient
Check and remove any leakage with the exhaust
pipe
4. Fuel pipe leaks or is blocked
Check the tightness of fuel pipes and the joints;
check the fuel pipes and check if the filter is dirty;
Repair or remove any blockage; replace the filter
element
5. Poor fuel quality
Wash the fuel tank, filter parts and fuel pipes;
replace the fuel
6. High oil level
Release the extra lubricating oil
