Fuel Injector - Jeep cherokee 1989 Owner's Manual

15.33 Be sure to remove the old O-ring and seal from the
injector (a replacement kit, available at a dealer, includes six
O-rings and seven seals enough O-rings and seals for all six
injectors and an extra seal for the fuel pressure regulator)
regulator (see illustrations). Refer t o Section 12 for information on
removing and replacing fuel line fittings.
2 4 Remove the fuel rail mounting bolts (see illustration).
25 If the vehicle is equipped with an automatic transmission, it may
be necessary to remove the automatic transmission line pressure cable
and bracket to remove the fuel rail assembly (see illustration 15.7).
26 Remove the fuel rail by simultaneously rocking and pulling up on
it until all injectors are out of the intake manifold. Work slowly and
carefully so you don't damage the assembly.
27 Installation is the reverse of removal, but be sure to do the
following:
bolts, position the tip of each injector above its corresponding
bore in the intake manifold (see illustration), then seat the injec-
tors by pushing down on them. You must seat the injectors prop-
erly before you tighten the fuel rail mounting bolts.
spacer and retainer repair kit (see Section 12).

Fuel injector

Refer to illustrations 15.32 and 15.33
28 Remove the fuel filler cap to relieve fuel tank pressure.
29 Relieve the system fuel pressure (see Section 2).
3 0 Detach the cable from the negative battery terminal.
31 Remove the fuel injector rail assembly (see above).
32 Remove the retaining clip(s) that attach the injector(s) to the rail
assembly (see illustration).
3 3 If you are servicing a leaking injector, remove the old O-rings and
seals (see illustration).
3 4 An O-ring kit is available from a dealer parts department. This kit
6
consists of brown and 7 black seals. The brown seals fit on the in-
jector tips; the black seals fit on the rail end of the injectors. Do not
switch the brown and black O-rings
composition. The extra black seal is for the fuel pressure regulator
see Step 42.
3 5 Because the O-ring kit includes enough O-rings for all six injectors
(they're not available individually), it's a good idea to replace the upper
and lower O-rings on all injectors, even if only one or t w o are actually
leaking at the time you service them. Otherwise, you will probably find
yourself repeating this entire procedure down the road
leaky injectors.
3 6 Installation is the reverse of removal. Be sure t o coat the injector
O-rings with a little fuel before installing the injectors.
Fuel pressure regulator
Refer to illustrations 75.40, 15.4 1 and 75.42
37 Remove the fuel filler cap t o relieve fuel tank pressure.
3 8 Relieve the system fuel pressure (see Section 2).
The Motor Manual Guy
Chapter 4 Fuel and exhaust systems
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they're different in design and
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to fix other
screws (arrows)
15.41 Pull the fuel pressure regulator off the end of the
fuel rail
15.42 Always install a new O-ring on the pressure regulator
4 0 Remove the fuel pressure regulator retaining screws (see illus-
tration).
4 1 Pull the regulator off the fuel rail (see illustration).
42 Whenever you remove the fuel pressure regulator, always install
a new O-ring (see illustration). This O-ring is available as part of an
O-ring kit for the injectors (see Step 3 4 above).
43 Installation is the reverse of removal.
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