Isuzu engine C22NE / 22LE / 20LE. Service manual — part 109

DRIVEABILITY AND EMISSIONS 6E1-265

7.

Install fuel rail assembly. Tighten the nuts to 19 N

⋅m (1.9

kgf

⋅m). Refer to Fuel Rail Installation Procedure.

Tighten the flare nut to 27 - 33 N

⋅m (2.8 - 3.4 kgf⋅m).

8.

Connect the negative battery cable.

FUEL PRESSURE REGULATOR

Removal

Caution: To reduce the risk of fire and personal injury, it is

necessary to relieve the fuel system pressure before

servicing the fuel system components.

Caution: After relieving the fuel system pressure, a small

amount of fuel may be released when servicing fuel lines

or connections. Reduce the chance of personal injury by

covering the fuel line fitting with a shop towel before

disconnecting the fittings. The towel will absorb any fuel

that may leak out. When the disconnect is completed,

place the towel in an approved container.

Notice: Compressed air must never be used to test or clean a
fuel pressure regulator, as damage to the fuel pressure
regulator may occur.

Notice: To prevent damage to the fuel pressure regulator, do
not immerse the pressure regulator in solvent.

Removal

1.

Depressurize the fuel system. Refer to Fuel Pressure
Relief Procedure.

2. Disconnect the negative battery cable.

3. Remove the fuel pump relay.

4. Disconnect the vacuum line form fuel pressure regulator.

6E1-266 DRIVEABILITY AND EMISSIONS

5. Remove the fuel pressure regulator retaining screw.

6.

Remove the fuel pressure regulator from fuel rail.

Installation

1. Insert the fuel pressure regulator into the fuel rail.

2. Install the fuel pressure regulator retaining bracket and

tighten with a screw.

3.

Connect vacuum line onto the fuel pressure regulator.

4. Install the fuel pump relay.

5. Connect the negative battery cable.

6. Crank the engine until it starts. Cranking the engine may

take longer than usual due to trapped air in the fuel line.

7.

Tighten the flare nut to 27 - 33 N

⋅m (2.8 - 3.4 kgf⋅m).

DRIVEABILITY AND EMISSIONS 6E1-267

FUEL PRESSURE RELIEF

WARNING

REMOVE SLOWLY

FUEL SPRAY MAY

CAUSE INJURY

Caution: To reduce the risk of fire and personal injury, it is

necessary to relieve the fuel system pressure before

servicing the fuel system components.

Caution: After relieving the fuel system pressure, a small

amount of fuel may be released when servicing fuel lines

or connections. Reduce the chance of personal injury by

covering the fuel line fitting with a short towel before

disconnecting the fittings. The towel will absorb any fuel

that may leak out. When the disconnect is completed,

place the towel in an approved container.

1. Remove the fuel filler cap.

2. Remove the fuel pump relay from the underhood relay

box.

3. Start the engine and allow it to stall.

4. Crank the engine for about 30 seconds.

5. Disconnect the negative battery cable.

FUEL PUMP ASSEMBLY

Removal

1. Disconnect the negative battery cable.

2. Drain all fuel from fuel tank from filler neck.

3. Remove the fuel pump relay from the fuse and relay box

at right side of engine room.

4. Remove fuel tank. Refer to Fuel Tank Removal

Procedure.

5. Using commercially available tool, loosen the screws on

the fuel pump and remove the fuel pump from the fuel
tank.

6E1-268 DRIVEABILITY AND EMISSIONS

6. Lift fuel pump to remove from fuel tank.

Inspection

Inspect in-tank fuel filter for tears, damage of evidence of dirt
derbris or water in the fuel. If any of these condition exist,
replace the in-tank fuel filter.

Installation

1.

Insert the fuel pump assembly into fuel tank and place
them in their position.

2. Using commercially available tool, tighten the screws to

the fuel pump assembly into the fuel tank.

3. Install the fuel tank. Refer to Fuel Tank Installation

Procedure.

4. Install the fuel pump relay.

5. Connect the negative battery cable.