Isuzu N-Series. Manual - part 383

6C-10 FUEL SYSTEM

Cartridge Replacement

Removal

Replacement Procedure

1. Loosen the used fuel filter by turning it counter-

clockwise with the filter wrench.

Installation

1. Clean the upper cover fitting face.

This will allow the new fuel filter to seat properly.

2. Apply a light coat of engine oil to the O-ring.
3. Supply fuel to the new fuel filter to facilitate bleed-

ing.

4. Turn in the new fuel filter until the filter O-ring is fit-

ted against the sealing face.
Be very careful to avoid fuel spillage.

5. Use the filter wrench to turn in the fuel filter an ad-

ditional 1/3 to 2/3 of a turn.

6. Operate the priming pump to bleed the air from the

fuel line.
Refer to “FUEL FILTER ASSEMBLY” for more de-
tailed information.

7. Start the engine.

Crank the engine for ten seconds or until it starts.
If the engine does not start after ten seconds, re-
peat Step 6.

Draining the Pre-fuel Filter

1. Loosen the air bleeding plug and drain plug by

turning them counterclockwise.

N6A0828E

N6A0829E

N6A0830E

N6A0014E

FUEL SYSTEM 6C-11

2. Drain approximately 0.1 liters (3.4 oz) of water.
3. Securely tighten the drain plug.
4. Operate the primer pump on the fuel pump to bleed

the fuel system.

5. Tighten the air bleeding plug.

6. Start the engine and check to be sure no fuel is

leaking from the drain plug.

7. Make sure that the warning light in the instrument

panel is off. (Except 4HE1-TC)

Legend

1. Air bleeding plug
2. Pre-fuel filter
3. Drain level
4. Drain plug

N6A0832E

N6A0026E

6C-12 FUEL SYSTEM

FUEL FILTER ASSEMBLY (4HF1-2 model only)

Component

Removal

Preparation

• Disconnect battery ground cable.

1. Filler cap
2. Lead switch wiring connector
3. Fuel hose

• Draw out inlet and outlet hoses from the fuel fil-

ter and cork the hoses to prevent fuel outflow.

4. Fuel filter installing bolt
5. Fuel filter assembly

Installation

1. Fuel filter assembly
2. Fuel filter installing bolt
3. Fuel hose

• Connect the inlet hose and outlet hose.

4. Lead switch wiring connector
5. Filler cap

Cartridge Replacement

Removal

1. Remove the cartridge using a filter wrench.

Special Tool
Filter wrench: 5-8840-0253-0

2. Remove the sedimenter/center.

Legend

1. Filter cap

4. Fuel filter installing bolt

2. Lead switch wiring connector

5. Fuel filter assembly

3. Fuel hoses

N6A0834E

N6A0835E

FUEL SYSTEM 6C-13

Reassembly

1. Fit the sedimenter/center in a new cartridge.
2. Clean the cartridge mounting surface of the filter

body so that the new cartridge can be seated com-
pletely.

3. Apply engine oil thinly to the new cartridge O-ring.
4. Fill the new cartridge with light oil to facilitate air

bleeding.

5. Tighten the cartridge until the O-ring comes into

contact with the sealing surface. Sufficient care
should be taken not to spill the light oil.
Give 1/3 to 2/3 of a turn using a filter wrench.
Special Tool
Filter wrench: 5-8840-0253-0

Air Bleeding

1. Actuate the priming pump (1) to send the air in the

fuel system to the injection pump.

2. Loosen the sedimenter air bleeding plug (2) and

operate the priming pump until no bubbles appear.

3. Tighten the air bleeding plug completely.
4. Try to start the engine. If the engine is not started

within 10 seconds, air bleeding should be conduct-
ed once again.

5. Check that there is no fuel leak, and then tighten

the priming pump completely.

Water Drain

If more than specified has collected, the warning light is
lit. Under this condition, follow the following water drain
procedure:

1. Place a container (Approximately 0.2 lit (0.18 Imp

qt/0.21 US qt) capacity) beneath the drain plug on
the separator.

2. Loosen the drain plug and air bleeding plug.
3. After draining, tighten the drain plug.
4. Operate the priming pump several times again and

check for fuel leak.

5. Tighten the air bleeding plug.
6. Make sure that the warning light in the instrument

panel is off.

Legend

1. Air bleeding plug

N6A0836E

N6A0837E

N6A0032E