Isuzu N-Series. Manual — part 531
6C-32 Fuel System
Notice:
Make sure that foreign matter will be prevented from
getting in.
1. Remove the air intake pipe.
• Disconnect the connector for the intake air
temperature sensor.
2. Remove the fuel leak-off hose from the leak-off
pipe.
• Cover the removed fuel hose, keep it facing
upward and secure it using wire, etc.
3. Disconnect the fuel rail pressure sensor harness
connectors.
4. Remove the EGR valve and the EGR adapter.
5. Tape the EGR case holes shut to prevent the entry
of foreign material.
Legend
1. EGR Adapter
2. EGR Valve
6. Remove the injection pipe clip and remove the
injection pipes.
Important:
Loosen the injection pipes gradually not to scatter high
pressure fuel.
Legend
1. Fuel Injection Pipe
2. Fuel Injection Pipe Clip
7. Remove the fuel pipe.
Important:
Loosen the fuel pipe gradually not to scatter high
pressure fuel.
N6A6368E
N6A6128E
Fuel System 6C-33
8. Remove the clips and the fuel leak-off pipe.
Legend
1. Fuel Pipe
2. Fuel Leak-off Pipe
9. Remove the fuel rail and the fuel rail bracket.
• Do not remove the flow damper.
The dampers should always remain in the fuel
rail.
• Take care not to damage the connector unit of
the pressure sensor.
Legend
1. Fuel Rail Bracket
2. Fuel Rail
Disassembly
1. Remove the fuel pressure limiter.
2. Remove the fuel rail pressure sensor.
Legend
1. Fuel Rail
2. Fuel Rail Pressure Sensor
3. Fuel Pressure Limiter
4. Flow Damper
Reassembly
1. Install the fuel pressure limiter.
Tighten:
Fuel pressure limiter to 172 N
⋅m (17.5 kg⋅m/127 lb⋅ft)
2. Install the fuel rail pressure sensor.
Tighten:
Fuel rail pressure sensor to 98 N
⋅m (10 kg⋅m/72 lb⋅ft)
N6A6383E
N6A6384E
1
3
2
4
N6A6385E
6C-34 Fuel System
Legend
1. Fuel Rail
2. Fuel Rail Pressure Sensor
3. Fuel Pressure Limiter
4. Flow Damper
Installation
1. Tighten the fuel rail bracket using the specified
mounting torque.
Tighten:
Nuts to 19 N
⋅m (1.9 kg⋅m/14 lb⋅ft)
2. Tighten the fuel rail using the specified mounting
torque.
Tighten:
Bolts to 19 N
⋅m (1.9 kg⋅m/14 lb⋅ft)
Legend
1. Fuel Rail Bracket
2. Fuel Rail
3. Tighten the fuel leak-off pipe (1) using the
mounting eyebolt and the clips using the specified
torque.
Tighten:
(2) to 18 N
⋅m (1.8 kg⋅m/13 lb⋅ft)
(3) to 12 N
⋅m (1.2 kg⋅m/104 lb⋅in)
(4) to 8 N
⋅m (0.8 kg⋅m/69 lb⋅in)
4. Tighten the fuel pipe (5) using the mounting sleeve
nut and the clip using the specified torque.
Tighten:
(6) to 44 N
⋅m (4.5 kg⋅m/33 lb⋅ft)
(7) to 6 N
⋅m (0.6 kg⋅m/52 lb⋅in)
(8) to 44 N
⋅m (4.5 kg⋅m/33 lb⋅ft)
5. Install the fuel leak-off hose to the fuel leak-off
pipe.
6. Tighten the injection pipe and the clip using the
specified mounting torque.
Tighten:
Injection pipe sleeve nut to 44 N
⋅m (4.5 kg⋅m/33 lb⋅ft)
Tighten:
Injection pipe clip to 6 N
⋅m (0.6 kg⋅m/52 lb⋅in)
1
3
2
4
N6A6385E
N6A6384E
N6A6386E
Fuel System 6C-35
• Apply a thin coat of engine oil on the periphery
of the sleeve nut on the fuel injector side and
assemble.
Legend
1. Fuel Injection Pipe
2. Fuel Injection Pipe Clip
7. Connect the fuel rail pressure (FRP) sensor
connector.
8. Install the gasket to the EGR valve and tighten the
bolts to the specified torque.
Tighten:
Bolt to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
9. Install the gasket to the EGR adapter and tighten
the bolts to the specified torque.
Tighten:
Bolt to 24 N
⋅m (2.4 kg⋅m/17 lb⋅ft)
Legend
1. EGR Adapter
2. EGR Valve Gasket
3. EGR Valve
4. EGR Valve Gasket
10. Install the air intake duct.
• Connect the connector for the intake air
temperature sensor.
N6A6128E
N6A6371E
N6A6121E
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