Daewoo Nubira. Manual - part 131

ENGINE CONTROLS  1F – 381

DAEWOO V–121 BL4

3.  Install the fuel pump access cover.
4.  Install the rear seat. Refer to Section 9H, Seats.
5.  Install the fuel pump fuse and the gas cap.
6.  Connect the negative battery cable.

FUEL FILTER

Removal Procedure

Disconnect the negative battery cable.

CAUTION : The fuel system is under pressure. To
avoid fuel spillage and the risk of personal injury or
fire, it is necessary to relieve the fuel system pressure
before disconnecting the fuel lines.

1.  Relieve the fuel system pressure. Refer to ”Fuel

System Pressure Relief”in this section.

2.  Disconnect the inlet/outlet fuel lines by moving the

line connector lock forward and pulling the hose off
of the fuel filter tube.

3.  Remove the fuel filter mounting bracket assembly

bolt.

4.  Remove the fuel filter.

Installation Procedure

1.  Install the new fuel filter into the retaining clamp.

Note the flow direction.

2.  Install the outer fuel filter mounting bracket and the

mounting bracket assembly bolt.

Tighten

Tighten the fuel filter mounting bracket assembly bolt
to 89 lb–in (10 N

S

m).

3.  Connect the inlet/outlet lines. Secure the lines with

the connector lock.

4.  Connect the negative battery cable.
5.  Perform a leak test of the fuel filter.

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I

ENGINE CONTROLS

DAEWOO V–121 BL4

FUEL RAIL AND INJECTORS

Removal Procedure

CAUTION : The fuel system is under pressure. To
avoid fuel spillage and the risk of personal injury or
fire, it is necessary to relieve the fuel system pressure
before disconnecting the fuel lines.

1.  Relieve the fuel system pressure. Refer to ”Fuel

System Pressure Relief”in this section.

2.  Disconnect the negative battery cable.
3.  Disconnect the intake air temperature (IAT) sensor

connector.

4.  Disconnect the breather hose from the valve cover.

5.  Remove the air intake tube and resonator.
6.  Disconnect the positive crankcase ventilation (PCV)

hose from the valve cover.

7.  Disconnect the throttle cables from the throttle body

and the bracket.

8.  Remove the fuel pressure regulator. Refer to ” Fuel

Pressure Regulator ” in this section.

9.  Disconnect the fuel return line at the fuel rail.
10.  Disconnect the fuel inlet line at the fuel rail.
11.  Remove the fuel rail retaining bolts.

Notice : Before removal, the fuel rail assembly may be
cleaned with a spray–type cleaner, following package in-
structions. Do not immerse the fuel rails in liquid cleaning
solvent. Use care in removing the fuel rail assembly to pre-
vent damage to the electrical connectors and the injector
spray tips. Prevent dirt and other contaminants from enter-
ing open lines and passages. Fittings should be capped
and holes plugged during service.

Important : If an injector becomes separated from the rail
and remains in the cylinder head, replace the injector O–
ring seals and the retaining clip.

12.  Remove the fuel rail with the fuel injector channel

cover and the injectors attached.

13.  Disconnect the fuel injector channel cover connec-

tors.

ENGINE CONTROLS  1F – 383

DAEWOO V–121 BL4

14.  Remove the fuel injector retainer clips.
15.  Remove the fuel injectors by pulling them down and

out.

16.  Discard the fuel injector O–rings.

Installation Procedure

Important : Important: Different injectors are calibrated
for different flow rates. When ordering new fuel injectors,
be certain to order the identical part number that is in-
scribed on the old injector.

1.  Lubricate the new fuel injector O–rings with engine

oil. Install the new O–rings on the fuel injectors.

2.  Install the fuel injectors into the fuel rail sockets

with the fuel injector terminals facing outward.

3.  Install the fuel injector retaining clips onto the fuel

injector and the fuel rail ledge.

4.  Make sure that the retaining clip should be parallel

to the fuel injector harness connector.

5.  Install the fuel rail assembly into the cylinder head.
6.  Install the fuel rail retaining bolts.

Tighten

Tighten the fuel rail retaining bolts to 18 lb–ft (25
N

S

m).

1F – 384

I

ENGINE CONTROLS

DAEWOO V–121 BL4

7.  Connect the fuel inlet line to the fuel rail.
8.  Connect the fuel return line to the fuel rail
9.  Install the fuel pressure regulator. Refer to ” Fuel

Pressure Regulator ” in this section.

10.  Connect the fuel injector channel cover and con-

nectors. Rotate each fuel injector as required.

11.  Connect the throttle cables to the throttle body

bracket.

12.  Connect the PCV hose to the valve cover.

13.  Install the air intake tube.
14.  Connect the breather hose to the valve cover.
15.  Connect the IAT sensor connector.
16.  Connect the negative battery cable.
17.  Perform a leak check of the fuel rail and fuel injec-

tors.

FUEL PRESSURE REGULATOR

Removal Procedure

CAUTION : The fuel system is under pressure. To
avoid fuel spillage and the risk of personal injury or
fire, it is necessary to relieve the fuel system pressure
before disconnecting the fuel lines.

1.  Relieve the fuel pressure. Refer to ” Fuel System

Pressure Relief”in this section.

2.  Disconnect the negative battery cable.
3.  Disconnect the intake air temperature (IAT) sensor

connector.

4.  Disconnect the breather hose from the valve cover.
5.  Remove the air intake tube.
6.  Disconnect the vacuum hose from the fuel pressure

regulator.

7.  Remove the fuel pressure regulator retaining

clamp.

8.  Remove the fuel pressure regulator by turning it

back and forth and then pulling it out.