Section 07
ENGINE MANAGEMENT (4-TEC)
Subsection 03
(COMPONENT INSPECTION AND ADJUSTMENT)
SMR2002-078 _07_03A.FM
07-03-11
FUEL RAIL
Pressure at fuel rail is supplied and controlled by
the fuel pump module. Refer to FUEL PUMP for
pressure test.
Fuel Rail Replacement
Removal
Remove fuel rail cover from the engine.
Release the fuel pressure in the system using
B.U.D.S. Look in the
Activation
tab.
Insert pointed tools each side.
Disconnect fuel hose at the connector.
1. Insert pointed tools each side
Wrap a rag around the hose end to prevent rail drain-
ing.
1. Fuel injector connectors
Disconnect wiring harness from the three fuel in-
jectors.
Cut tie raps and remove the wiring harness from
the fuel rail.
Unscrew rail retaining screws.
Gently pull rail up by hand, working each side slight-
ly at a time.
Pull rail out with fuel injectors.
If necessary remove fuel injectors as described be-
low.
Installation
For installation, reverse the removal process but
pay attention to the following.
A thin film of injection oil should be applied to
O-rings of fuel injectors to ease installation in in-
take manifold.
Apply Loctite 243 on rail retaining screws then torque
to 10 N•m (89 lbf•
in
).
When installing fuel line connector to the fuel rail,
put some oil on the O-ring to ease installation.
FUEL INJECTOR
Leakage Test
To perform a leakage test, the injectors and fuel
rail have to be removed from the engine. Refer to
REMOVAL in FUEL RAIL REPLACEMENT for the
procedure.
NOTE:
Do not detach injectors from the fuel rail.
Reconnect the fuel line and the wiring harness.
Place each injector in a clean bowl.
Install the safety lanyard cap on the DESS post to
activate the fuel pump.
Check for fuel leakage from the injector nozzle.
There should be less than 1 drop per minute. Per-
form the test for 2 minutes.
If not within specification, replace the fuel injector(s).
The leakage test is validated when performing the
FUEL DELIVERY SYSTEM DIAGNOSTIC FLOW
CHART elsewhere in this section.
1
R1503motr162A
1
R1503motr163A
WARNING
Perform a fuel pressure test and ensure that
there is no leak. Refer to FUEL PUMP above.
Run engine and check for leaks.
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