rail down until fuel injectors have bottomed on injec-
tor shoulder.
(6) Install fuel rail mounting bolts.
(7) Connect electrical connector to intake manifold
air temperature sensor.
(8) Connect electrical connectors at all fuel injec-
tors. To install connector, refer to (Fig. 31). Push con-
nector onto injector (1) and then push and lock red
colored slider (2). Verify connector is locked to injec-
tor by lightly tugging on connector.
(9) Install A/C support bracket (if equipped).
(10) Install throttle body to intake manifold. Refer
to Throttle Body installation in this group.
(11) Install fuel tube (line) at side of fuel rail.
Refer to Quick-Connect Fittings for procedures.
(12) Install air cleaner.
(13) Connect battery cable to battery.
(14) Start engine and check for leaks.
FUEL INJECTOR RAIL—4.7L V–8 ENGINE
WARNING: THE FUEL SYSTEM IS UNDER CON-
STANT PRESSURE EVEN WITH ENGINE OFF.
BEFORE SERVICING FUEL RAIL, FUEL SYSTEM
PRESSURE MUST BE RELEASED.
CAUTION: The left and right fuel rails are replaced
as an assembly. Do not attempt to separate rail
halves at connector tube (Fig. 34). Due to design of
tube, it does not use any clamps. Never attempt to
install a clamping device of any kind to tube. When
removing fuel rail assembly for any reason, be care-
ful not to bend or kink tube.
REMOVAL
(1) Remove fuel tank filler tube cap.
(2) Perform Fuel System Pressure Release Proce-
dure.
(3) Remove negative battery cable at battery.
(4) Remove air duct at throttle body air box.
(5) Remove air box at throttle body.
(6) Remove wiring at rear of generator.
(7) Disconnect fuel line latch clip and fuel line at
fuel rail. A special tool will be necessary for fuel line
disconnection. Refer to Quick-Connect Fittings.
(8) Remove vacuum lines at throttle body.
(9) Disconnect electrical connectors at all 8 fuel
injectors. To remove connector refer to (Fig. 35). Push
red colored slider away from injector (1). While push-
ing slider, depress tab (2) and remove connector (3)
from injector. The factory fuel injection wiring har-
ness is numerically tagged (INJ 1, INJ 2, etc.) for
injector position identification. If harness is not
tagged, note wiring location before removal.
(10) Disconnect electrical connectors at throttle
body.
(11) Disconnect electrical connectors at MAP and
IAT sensors.
(12) Remove first three ignition coils on each bank
(cylinders #1, 3, 5, 2, 4 and 6). Refer to Ignition Coil
Removal/Installation.
(13) Remove 4 fuel rail mounting bolts (Fig. 34).
(14) Gently rock and pull left side of fuel rail until
fuel injectors just start to clear machined holes in
cylinder head. Gently rock and pull right side of rail
until injectors just start to clear cylinder head holes.
Repeat this procedure (left/right) until all injectors
have cleared cylinder head holes.
Fig. 34 Fuel Rail Mounting—4.7L V-8 Engine
1 – MOUNTING BOLTS (4)
2 – INJ.#7
3 – INJ.#5
4 – QUICK-CONNECT FITTING
5 – INJ.#3
6 – FUEL INJECTOR RAIL
7 – INJ.#1
8 – CONNECTOR TUBE
9 – INJ.#2
10 – INJ.#4
11 – INJ.#6
12 – INJ.#8
13 – PRESSURE TEST PORT CAP
DN FUEL SYSTEM 14 - 19
REMOVAL AND INSTALLATION (Continued)
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