2.3.7 Diagnostic Procedures and Description 

2.3.7.1 Diagnosis descriptions 

Refer to 2.3.2 Description and Operation, get familiar with the system functions and operation 
before starting system diagnosis, so that it will help to determine the correct diagnostic steps, more 
importantly, it will also help to determine whether the situation described by the customer is 
normal. 

2.3.7.2 Visual inspection 

z  Inspect installed after market equipment that may affect the operation of the fuel system. 

z  Inspect the easy to access system components to identify whether there is significant damage 

or the existence of an external leakage. 

z  Inspect whether the fuel is the recommended type and fill up the fuel tank. 

2.3.7.3 Fuel Pressure Testing Procedure 

Warning: Gasoline and gasoline vapor is highly flammable. In order to avoid fire or 
explosion, please select to keep away from a fire. It is prohibited to use mobile phones during 
this procedure. Do not use open containers to store gasoline or exhaust emissions. Before 
carrying out this procedure, please prepare a dry-chemical fire extinguisher. 

Warning: Wrap a cloth around the fuel pressure gage and fuel distributing pipe joints to 
absorb leaked fuel when you connect the fuel pressure gage to reduce the risk of fire and 
injury. Upon completion of testing, place the cloth into the designated containers. Clean the 
oil pipe connector before dismantling the oil pipe. 

Warning: It is prohibited to pour or store fuel in an open container, otherwise it will cause a 
fire. 

1 

Install fuel pressure gage in the fuel distributing pipe inlet. 

 

2 

Place the fuel pressure gage exhaust hose into a specified gasoline container. 

 

3 

Open the valve on the fuel pressure gage to discharge the air from the gage. 

 

4 

Turn the ignition switch to the position "ON". 

 

5 

Use fault diagnosis tester "Function Test" drive fuel pump fuel pump relay, until all 
the air expelled from pressure gage. 

 

6 

Turn off the exhaust valve on the fuel pressure gage. 

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7 

Use fault diagnosis tester to connect the fuel pump to inspect whether there is fuel 
leakage and the leakage location. 

 

8 

When there is no leakage in the pipeline, start the engine and the fuel pressure should 
be 400 kPa (58.01psi). 

 

9 

Turn the ignition switch to "OFF" position.i under normal circumstances the system 
should maintain residual pressure above 250 kPa (36.26 psi). If the fuel pressure 
continues to drop, inspect the fuel pump or fuel pressure regulator. 

 

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2.3.8 Removal and installation 

2.3.8.1 Fuel Pressure Release Procedure 

1.  Open the fuel tank cap. 

2.  Open the hood, pull out fuel 

pump fuse EF25 (15 A). 

3.  Start the engine until the engine 

stops running automatically. 

4.  Start the engine again, so that the 

crankshaft continues to rotate 
about 10s. 

Note: If you want to dismantle any 
fuel system components, wrap pipe 
joints with plastic bags to prevent fuel 
leakage and prevent the entry of 
foreign matter. 

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2.3.8.2 Replacement of Fuel Filter 

Dismantlement Procedure

 

Warning: Refer to "Warning on Release Fuel Pressure" in "Warnings and Precautions". 

1.  Release fuel pressure. Refer to 

2.3.6.1 Fuel Pressure Release 
Procedure. 

2.  Disconnect the battery negative 

cable. Refer to 2.12.6.1 Battery 
Cable Disconnection/Connection 
Procedures. 

3.  Lifting and Jacking the Vehicle 

Warning: Refer to "Warning on 
Vehicle Lifting and Jacking" in 
"Warnings and Precautions". 

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4.  Disconnect the fuel inlet and outlet pipes. 

5.  Dismantle the fixing bolts of fuel filter bracket. 

Note: If sand enters into the pipe joints, removal may become difficult. With a wood handle 
gently knock the filter housing to remove the sand, and then push the pipe toward the filter 
direction. Press the lock to disconnect the pipe. After that, pull the quick coupling out of the fuel 
filter joint at the direction shown in the figure. 

Installation Procedure: 

1.  Install the fuel filter to the 

bracket and tighten the fixing 
bolts. Pay attention to the 
direction of the filter. 

Torque: 8 Nm (Metric) 6 lb-ft (English 
system) 

2.  Connect the fuel inlet and outlet 

pipes. 

3.  Connect the battery negative 

cable . 

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