5.0/5.7L Fuel Metering System 3A - 11
MEFI 4 - PCM
Fuel Rail Assembly
The fuel rails should be removed as an assembly with
the injectors attached. Names of component parts will
be found on the numbered list that accompanies the
disassembled view.
Notice:
•
Use care in removing the fuel rail assembly to prevent
damage to the injector electrical connector terminals
and the injector spray tips.
•
When removed, support the rail to avoid damaging
its components.
•
Prevent dirt and other contaminants from entering
open lines and passages. Fittings should be capped
and holes plugged during servicing.
Clean
•
Before removal, the fuel rail assembly may be cleaned
with a spray type engine cleaner, GM X-30A or
equivalent, following package instructions. Do Not
soak fuel rails in liquid cleaning solvent.
Caution: Safety glasses must be worn when using
compressed air as flying dirt particles may cause
eye injury.
•
Where injectors fi t into intake manifold, use compressed
air to blow out dirt from around injectors before
removing.
Remove or Disconnect
Caution: To reduce the risk of fi re and personal injury,
relieve the fuel system pressure before servicing the
fuel system components.
1. Negative battery cable.
2. Relieve fuel pressure.
•
Refer to the “Fuel Pressure Relief Procedure.”
•
Fuel pressure connector assembly is located on
the fuel rail.
3. Fuel inlet line, follow procedure for Quick Connect
Fittings outlined in this section.
4. Fuel outlet line, follow procedure for Quick Connect
Fittings outlined in this section.
5. Vacuum line to fuel pressure regulator.
6. Electrical connectors from injectors.
7. Move wire harness out of way.
8. Four attaching screws for fuel rail.
9. Fuel rails as an assembly with injectors.
10. Injectors from rails, follow procedure for injector
removal outlined in this section.
Clean and Inspect
Notice: If it is necessary to remove rust or burrs from
the fuel rail pipes, use emery cloth in a radial motion with
the tube end to prevent damage to the O-ring sealing
surface.
•
Use a clean shop towel to wipe off male pipe ends.
•
Inspect all connectors for dirt and burrs. Clean or
replace components/assemblies as required.
Disassemble
•
Injector O-ring seal from spray tip end of each injector.
Discard O-ring seals.
Assemble
•
Lubricate new injector O-ring seals with clean engine
oil and install on spray tip end of each injector.
Install or Connect
1. Lubricate injector O-ring seals and install injectors
following injector installation procedure outlined in
this section.
2. Fuel rails as an assembly with injectors onto intake
manifold.
•
If injectors are lined up properly they will slide into
place.
•
Push gently and evenly on rail to set injectors all
the way into their bores
3. Fuel rail attaching screws. Torque to 10 N•m (88
lb.in.).
4. Injector electrical connectors and secure harness
in place.
5. Vacuum line to fuel pressure regulator.
6. Fuel inlet line, follow procedure for Quick Connect
Fittings outlined in this section.
7. Fuel outlet line, follow procedure for Quick Connect
Fittings outlined in this section.
8. Negative battery cable.
9. Prime fuel system by cycling key “ON” and “OFF” a
few times with engine “OFF.”
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