JAC S2. Engine. Instruction - part 12

 

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JAC S2. Engine. Instruction - part 12

 

 

                                                                                                                       

Engine ignition system

 

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14. Only use the genuine fuel system parts provided by JAC. 

 

 

(V) Special tool 

 

SN 

Tool 

Diagram 

Description 

Fuel pressure gauge 

 

To measure fuel pressure 

Lock nut fixing plate 

 

Dismount the locknut of fuel pump 

 

 

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II. Failure diagnosis 

 

(I) Diagnosis analysis table 

 

SN  Failure phenomenon 

Failure cause analysis 

Solution 

Fuel supply system failure 

Insufficient fuel supply by 

pump 

Repair or replace 

Fuel tube and filter 

congestion 

Clean 

Insufficient power during 

running 

Improper adjustment of 

acceleration pedal and throttle 

valve 

1. Check if the throttle, ignition 

plug and cylinder head gasket 

have leakage 

The compressing pressure of 

cylinder deminution 

2. Cylinder grinded 

Insufficient supply of fuel 

Adjust or repair 

Insufficient air intake  

Check the air intake system 

Exhaust congestion 

Check the exhaust system and 

clear the carbon deposit 

Improper ignition plug 

clearance or ignition plug 

damaged 

Adjust or repair 

 

 

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(II) Diagnosis procedures table 

 

The fuel pump doesn’t work 

 

 
 
 
 
 
 
 
 

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III. Release the fuel system pressure 

 

(I) Release the fuel system pressure 
Attention: After releasing the fuel system pressure, please use the towel to wrap the joints when detaching it 
in case of the surplus fuel overflew. 

 

1. Release the fuel system pressure 

1) Turn the ignition switch to OFF gear and detach the cathode wire of battery. 

2) Dismantle the relay of fuel pump. 

Attention: It may appear the failure code when dismantling the relay of fuel pump, please use the 
diagnosis device to clear the code after releasing the fuel system pressure. 

3) Connect the cathode wire of battery. 

4) Start up engine and keep it at idling state, turn the ignition switch to OFF gear when the engine 
is OFF automatically. 

5) Disconnect the cathode wire of battery then install the relay of fuel pump. 

6) Connect the cathode wire of battery. 

7) Use the diagnosis device to clear the failure code relative with the relay of fuel pump (if 
necessary). 

 

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IV. Fuel tank assy 

(I) Disassembly 

 

1. Open the engine hood 
2. Release the fuel system pressure 
3. Disconnect the cathode wire of battery. 
4. Dismantle the rear seats cushion assy 
5. Dismantle the fuel tank assy 
1)  Pry up the access cap of fuel tank by the slot screwdriver. 

 

 

 

 

 

 

 

 

 

 

 

 
 
 

2) Disconnect the wires connector on fuel pump 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3) Loosen the clamp of fuel filling tube and fuel 
tank then pull out the filling tube. 
 

 
 

 

 

 

 

 

 

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4) Disconnect the fuel tank tube with the tube installed in fender. 
 

 

 

 

 

 

 

 

 

 

 

 
 
 

5) Screw off the fixed bolt of the 
front and rear strap of fuel tank. 
6) Lower down the fuel tank slowly 
as support the tank by tray 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(II) Check 

 

 

 

1. Check the fuel tank assy 
1) Check if it has damage or severe deformation of fuel tank surface. 

 

(III) Installation 

 

1. Install the fuel tank assy 
1) Hoist the tank to the installation position and install the front and rear strap and tighten the bolts 
for fixing the tank. 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

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2) Connect the fuel tank tube with the tube 
inside fender 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
 

3) Connect the fuel filling tube with tank and 
tighten the clamp 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4) Connect the wires connector 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5) Install the access cap of fuel tank 
 

 

2. Install the rear seat cushion assy 
3. Descend the car 
4. Connect the cathode wire of battery 
5. Close the engine hood. 
 

 S2-

 

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V. Fuel evaporation nylon tube assy 

 

(I) Disassembly 

 

1. Open the engine hood 
2. Release the fuel system pressure 
3. Disconnect the cathode wire of battery. 
4. Dismantle the rear seats cushion assy 
5. Dismantle the fuel tank assy 
6. Dismantle the fuel evaporation nylon tube assy 
1) Disconnect the fuel evaporation nylon tube assy with the fuel tank. 
2) Take down the fuel evaporation nylon tube assy 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(II) Installation 

 

1. Install the fuel evaporation nylon tube assy 
1) Connect the fuel evaporation nylon tube assy with the fuel tank 
 

 

 

 

 

 

 

 

 

 

 

 

 

 
 
2. Install the fuel tank assy 
3. Install the rear seat cushion assy 
4. Connect the cathode wire of battery 
5. Close the engine hood 
 

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VI. Fuel inlet nylon tube assy 

 

(I) Disassembly 

 

1. Open the engine hood 
2. Release the fuel system pressure 
3. Disconnect the cathode wire of battery. 
4. Dismantle the rear seats cushion assy 
5. Dismantle the fuel tank assy 
6. Dismantle the fuel inlet nylon tube assy 
1). Disconnect the fuel inlet nylon tube assy with fuel filter 

 

 

 

 

 

 

 

 

 

 

 

 
 
 

2) Disconnect the fuel inlet nylon tube assy with fuel 
tank. 
3) Take down fuel inlet nylon tube assy. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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(II) Installation 

 

1. Install fuel inlet nylon tube assy 
1) Connect the fuel inlet nylon tube with fuel tank 
 

 

 

 

 

 

 

 

 

 

 

 

 
 
 

2) Connect the fuel inlet nylon tube 
with fuel filter 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
2. Install the fuel tank assy 
3. Install the rear seat cushion assy 
4. Connect the cathode wire of battery 
5. Close the engine hood 

 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 
 

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VII. Fuel return nylon tube assy 

 

(I) Disassembly 

 

1. Open the engine hood 
2. Release the fuel system pressure 
3. Disconnect the cathode wire of battery. 
4. Dismantle the rear seats cushion assy 
5. Dismantle the fuel tank assy 
6. Dismantle the fuel return nylon tube assy 
1) Disconnect the fuel return nylon tube with fuel tank 
2) Take down the fuel return nylon tube assy. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(II) Installation 

 

1. Install fuel return nylon tube assy 
1) Connect the fuel return nylon tube with fuel tank assy 
 

 

 

 

 

 

 

 

 

 

 

 

 
 
 

 
 
 
 
 
 
 

 
 
 
 
 
 

2. Install 
the fuel 

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tank assy 
3. Install the rear seat cushion assy 
4. Connect the cathode wire of 
battery 
5. Close the engine hood 

 

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VIII. Fuel delivery pump assy 

 

(I) Disassembly 

 

1. Open the engine hood 
2. Release the fuel system pressure 
3. Disconnect the cathode wire of battery. 
4. Dismantle the rear seats cushion assy 
5. Dismantle the fuel delivery pump assy 
1) Pry up the access cap of fuel tank by the slot screwdriver. 

 

 

 

 

 

 

 

 

 

 

 

 

 
 

2) Disconnect the wires connector of fuel delivery 
pump 
Attention: Do not use any tool to disconnect the 
joint 
Attention: Cover the junction place by plastic bag 
in case of other impurities getting inside. 

 

 

 

 

 

 

 

 

 

3) Loosen the snap ring of fuel pump by the 
special tool 
 

 
 

 

 

 

 

 

 

 

 

 

 

 

 

 
 

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4) Take down the flang sealing ring of fuel pump 
 

 

 

 

 

 

 

 

 

 

 

 
 
 

5) Take out the fuel pump 
Attention: Please maintain at the skew position 
when take out the fuel pump so as to avoid 
damaging the fuel level sensor. 

 

 

 

 

 

 

 

 

 

 
 

 

 

(II) Check 

 

 

 

1. Check the fuel delivery pump assy 
1). Check if it has damage or fuel particles, if has, clean or change it. 
2). Resistance check.Connect the 2 pins at the right side of connector on pump then measure the 
resistance value of the fuel level sensor at the lowest and highest condition, the lowest resistance 
value is 200Ω±5Ω and the highest resistance value is  25Ω±3Ω. 
3). Do not keep running for long time to avoid pump core damage. 

 

2. Check Y sealing ring 

1) Check if it has rupture or defects. 

3. Check the fixed snap ring of pump 
1). Check if it has deformation, crack, defects, damage 
and check if the mounting thread has damage. 
4. Check the fuel level sensor 
1). Check if the floater has deformation and if its surface 
has dirts 

 

 

 

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Engine ignition system

 

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(III) Installation 

 

1. Install 
fuel delivery pump assy 
1) Put the pump inside fuel tank 
Attention: Put in the pump at a skew position and make sure the  
Assembly direction is correct. 

 

 

 

2) Install the flange sealing ring of fuel pump 
Attention: The sealing ring needs to be matched with fuel tank completely and without turnup. 
 
3). Install the fixed snap ring of fuel pump 
Tighten torque: 75N.m±5N·m 
Attention: Please pre-tighten and then screw it tightly 
 
 
 
 
 
 
 
 
 
 
 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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