Isuzu N-Series. Manual - part 400

6C-78 FUEL SYSTEM

At this time, hold control rack using a spanner (to
prevent the rack from bending).

Specified torque: 3.4 — 4.9 N

⋅m (0.35 — 0.5 kg⋅m/2.5

— 3.6 lb

⋅ft)

4. While pulling stop lever, install rack sensor to rack

sensor core.

5. Tighten the two flnge fixing screws.

Specified torque: 6.9 — 8.8 N

⋅m (0.7 — 0.9 kg⋅m/5.1

— 6.5 lb

⋅ft))

6. Connect the rack sensor wire harness to constant

voltage power supply and digital voltmeter.

7. Turn constant voltage power supply power switch

ON and set it to DC 5

±0.01V.

8. Apply at least 44.0 kPa (330 mmHg/6.38 psi) boost

pressure, set pump speed at N = 1,000 r/min, and
hold speed control lever against the full speed
stopper bolt.

9. Confirm the rack sensor output voltage from the

digital voltmeter. (Vist = 2.77

±0.28V)

10. Confirm that the voltage changes when the speed

control lever is moved to the idle and full sides.

Legend

1. Sensor output voltage (V)
2. Rack position (mm)

N6A0970E

FUEL SYSTEM 6C-79

FUEL TANK

Component

Removal

Preparation

• Disconnect the battery ground cable.
• Loosen the fuel filler cap.
• Drain fuel from drain plug.
• After the drain fuel, tighten the drain plug to the

specified torque.

Tighten:
Drain plug to 29 N

⋅m (3 kg⋅m / 22 lb⋅ft)

1. Evapo Fuel Hose
2. Fuel Feed Hose
3. Fuel Return Hose

• Plugging the return hose to prevent fuel from

getting spilt, tie it to the fame with the plugged
end up.

4. Fuel Gauge Unit Connector

• Remove the fuel gauge unit connector.

5. Band

• Remove the nut of the fuel tank fixing band, and

then remove the band end on the frame side.

6. Fuel Tank

• Pull out the fuel tank to the outside.

Notice:
When it is not possible to pull out the fuel tank, remove
the bracket and then draw out the fuel tank downward.

Installation

1. Fuel Tank

Notice:
When the bracket was removed to take off the fuel tank,
install the bracket to the frame and tighten it to the spec-
ified torque.

Legend

1. Evapo fuel hose

5. Band

2. Fuel feed hose

6. Fuel tank

3. Fuel return hose

7. Frame

4. Fuel gauge unit connector

N6A0971E

6C-80 FUEL SYSTEM

Tighten:
Fuel tank bracket to 55 N

⋅m (5.6 kg⋅m / 41 lb⋅ft)

Also, when mounting the fuel tank to the bracket, place
the packing section attached to the fuel tank securely on
the bracket.

2. Band

• Tighten the band to 12 N

⋅m (1.2 kg⋅m /104 lb⋅in)

3. Fuel Gauge Unit Connector

• Connect the fuel gauge unit connector.

4. Fuel Return Hose
5. Fuel Feed Hose

• Set the hose to the pipe more than 25 mm (0.98

in) deep.

6. Evapo Fuel Hose

• Fill the fuel to the fuel tank.
• Connect battery ground cable.

FUEL SYSTEM 6C-81

FUEL GAUGE UNIT

Component

Removal

Preparation
Disconnect the Battery ground cable.

1. Fuel Gauge Unit Connector

• Disconnect the fuel gauge unit connector from

the fuel gauge unit.

2. Fuel Gauge Unit

• Remove the fuel gauge unit fixing screw and

fuel gauge unit.

Notice:
After removing fuel gauge unit, cover fuel tank with
waste to prevent any dust entering

Installation

1. Fuel Gauge Unit
2. Fuel Gauge Unit Connector

• Connect the wiring connector to the fuel gauge

unit.

Legend

1. Fuel gauge unit connector

3. Evapo fuel hose

2. Fuel gauge unit

4. Frame

N6A0972E