Lifan 620 Maintenance Manual page 76

S/N
12 Check if the fuel is wrong or contains water.
13 Check if the fuel pressure is lower than 380kPa.
Close the fuel gauge valve. Turn on the ignition switch
14 again and keep the fuel pump working for 3 seconds.
Check if fuel pressure can be produced.
Turn on the fuel gauge valve, and block the fuel return
15
pipe. Check if the fuel pressure is quickly produced.
16 Check the fuel intake pipe for leakage or blockage.
17 Check if the fuel return pipe is blocked or bent.
Check if the sense hole of the intake air manifold
18
pressure and temperature sensor is blocked.
Run the engine at an idle speed. After the coolant
19 reaches the temperature activated by the closed loop
control, check the oxygen sensor for normal operation.
20 Check the intake air system of the engine for leakage.
21 Check if the cylinder pressure of the engine is normal.
www.CarGeek.ir
Table 1-56 (Continued)
Operation
75
www.cargeek.ir
Test Results Actions
Yes Replace fuel
No 18
Yes Next step
No 17
Yes Next step
No 16
Replace fuel pressure
Yes
regulator
Repair or replace fuel
No
injector or fuel pipe
Repair or replace fuel return
Yes
pipe
No Replace fuel pump
Repair or replace fuel return
Yes
pipe
Replace fuel pressure
No
regulator
Yes Clean up
No Next step
Yes Next step
Check oxygen sensor and
No
harness
Yes Repair the leakage
No Next step
Yes Next step
No Remove the trouble