Isuzu N-Series. Service manual — part 523
Cooling System 6B-23
Torque Specifications
N6A6448E
Fuel System 6C-1
ENGINE
Fuel System
TABLE OF CONTENTS
Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6C-2
Fuel Filter Assembly . . . . . . . . . . . . . . . . . . . . . .6C-16
Fuel Filter Cartridge . . . . . . . . . . . . . . . . . . . . . .6C-17
Fuel Injector . . . . . . . . . . . . . . . . . . . . . . . . . . . .6C-18
Fuel Supply Pump. . . . . . . . . . . . . . . . . . . . . . . .6C-26
Fuel Rail . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6C-31
Fuel Sedimenter Switch . . . . . . . . . . . . . . . . . . .6C-37
Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . .6C-37
Fuel Tank. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6C-38
Fuel Gauge Unit . . . . . . . . . . . . . . . . . . . . . . . . .6C-40
6C-2 Fuel System
Fuel System
Service Precautions
Parts of the fuel system such as the internal part of the
fuel injector, holes and clearances that form passages
for fuel are finished to a very high degree of accuracy.
They are therefore highly sensitive to foreign matter
and the entry of foreign matter could cause damage to
the fuel passage. Therefore, effective measures should
be taken to prevent the entry of foreign matter.
If water removal agent is used in the fuel then it will
absorb moisture in the light oil and may cause rust.
Therefore, do not use water removal agent in the fuel
tank.
Work Procedure
• The fuel opening must be quickly sealed when
removing the fuel pipe, injection pipe, fuel injector,
fuel supply pump, and fuel rail.
• The eyebolts and gasket must be stored in a clean
parts box with a lid to prevent adhesion of foreign
matter.
• Fuel leakage could cause fires. Therefore, after
finishing the work, wipe off the fuel that has leaked
out and make sure there is no fuel leakage after
starting the engine.
Explanations on Functions and Operation
Fuel System Diagram
Legend
1. Fuel Rail
2. Leak-off Pipe
3. Fuel Injector
4. Fuel Return Pipe
5. Fuel Feed Pipe
6. Fuel Tank
7. Ventilation Hose
8. Fuel Filler Cap
9. Fuel Level Sensor
10. Fuel Filter With Sedimenter
11. Fuel Supply Pump
Caution:
• Do not let foreign matter such as sand or dust get
into fuel.
• Use gas oil for fuel, not others.
4
5
9
7
8
N6A6661E
Fuel System 6C-3
Fuel Rail
Legend
1. Flow Damper
2. Pressure Limiter
3. Pressure Sensor
N6A6358E
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