Isuzu KB P190. Manual — part 531

6C-6 ENGINE FUEL (C24SE)

Fuel Filter

Inspection

1. Replace the fuel filter if the fuel leaks from fuel filter

body or if the fuel filter body itself is damaged.

2.

Replace the filter if it is clogged with dirt or
sediment.

Installation

1. Install the filter to holder from fuel tank front side.

NOTE: Attend direction of fuel filter. (1) to engine side
(2) to fuel tank side.

NOTE: Verify to hang holder hook to fuel filter.

RTW36CSH000301

2. Connect the quick connector from the fuel tube to

the fuel filter.

NOTE: Pull of the left checker into the fuel pipe.

NOTE: Refer to “Fuel Tube/Quick Connector Fittings” in
this section when performing any repairs.

3. Tighten fuel filler cap until at least one click are

heard.

4. Connect the battery ground cable.

Inspection

After installation, start engine and check for fuel
leakage.

In–Tank Fuel Filter

The filter is located on the lower end of fuel pickup tube
in the fuel tank. It prevents dirt from entering the fuel
pipe and also stops water unless the filter is completely
submerged in the water. It is a selfcleaning type, not
requiring scheduled maintenance. Excess water and
sediment in the tank restricts fuel supply to the engine,
resulting in engine stoppage. In such a case, the tank
must be cleaned thoroughly.

ENGINE FUEL (C24SE) 6C-7

Fuel Pump Flow Test

If reduction of fuel supply is suspected, perform the
following checks.

1. Make sure that there is fuel in the tank.

2. With the engine running, check the fuel feed pipe

and hose from fuel tank to injector for evidence of

leakage. Retighten, if pipe or hose connection is

loose. Also, check pipes and hoses for squashing

or clogging.

3. Insert the hose from fuel feed pipe into a clean

container, and check for fuel pump flow rate.

4. Connect the pump relay terminals (2) with a

jumper wire (1) as shown and start the fuel pump

to measure delivery.

RTW36CSH000201

CAUTION: Never generate sparks when connecting
a jumper wire.

Delivery Delivery

15 seconds

0.38 liters minimum

If the measure value is out of standard, conduct the
pressure test.

Pressure test

For the pressure test to the fuel system, see Section 6E
“Fuel Control System".

6C-8 ENGINE FUEL (C24SE)

Fuel Pump

Fuel Pump and Associated Parts

RTW46FMF000401

Legend

(6) Fuel Tube/Quick Connector

(1) Fuel Feed Port

(7) Retainer Ring (Fuel Pump Lock)

(2) Fuel Return Port

(8) Seal; Fuel Pump

(3) Fuel Emission Port

(9) Fuel Tank Assembly

(4) Fuel Pump and Sender Assembly

(10) Evapo Tube/Quick Connector

(5) Connector; Fuel Feed Pump & Sender

Removal

CAUTION: When repair to the fuel system has been
completed, start engine and check the fuel system
for loose connection or leakage. For the fuel system
diagnosis, see Section “Driveability and Emission".

1. Remove fuel tank assembly (9). Refer to “Fuel

Tank Removal" in this section.

2. Disconnect the quick connector (6) into the fuel

tube from fuel pump.

3. Disconnect the quick connector (10) into the evapo

tube from fuel pump.

ENGINE FUEL (C24SE) 6C-9

3. Remove the retainer ring (7) from the fuel tank

with the removal tool 5-8840-2602-0.

140R100035

4. Remove slowly the fuel pump (4) from the fuel

tank as no bend float arm.

NOTE: Cover opening for the fuel pump on fuel tank to
prevent any dust enthering.

5. Discard fuel pump seal (8) because it cannot be

reusable.

Installation

1. Clean the seal surface of the fuel tank and the fuel

pump.

NOTE: If there is dust on the seal surface, it becomes
cause of fuel leak.

2. Install the new fuel pump seal (8) to opening of the

fuel tank as along the groove.

3. Install slowly the fuel pump (4) into the fuel tank as

no bend float arm.

4. Set flange of the fuel pump on fuel pump seal as

mating convexity of the fuel pump and reentrant of

the fuel tank.

5. Lock slowly the retainer ring (7) to the fuel tank

with the remover tool 5-8840-2602-0.

6. Connector the quick conector (10) into the evapo

tube to fuel pump.

7. Connect the quick connector (6) into the fuel tube

to fuel pump.

NOTE: Pull off the left ckecker into the fuel pipe.

NOTE: Refer to “Fuel Tube/Quick Connector Fittings” in
this section when performing any repairs.

8. Check leak.

Methed of leak check.

(1) Plug end of quick connector and breather hose

(Pull off the breather hose from fuel tank) and

tighten fuel filler cap until at least one click are

heard.

(2) Apply water soap around the fuel pump seal

area.

(3) Pressure air into the fuel tank from end of

breather pipe at 5psi (34.3 kPa/2.8kgf/cm

2

)

over 15 seconds.

(4) Verify no bubbles around the fuel pump seal

area.

8. Install the fuel tank assembly (9).

NOTE: Refer to “Install the fuel tank” in this section.