Hummer H1 Service Manual page 174

___________________________________________
®
Fuel Injector Replacement
Removal
1. If removing rear injector, remove console and engine
cover. Remove fuel return hose and cap from injector
(Figure 3-52).
2. Disconnect fuel return hoses from necessary injector
(Figure 3-53).
3. Remove clamp, and fuel injector line bracket and clamp.
4. Disconnect fuel line at injector (Figure 3-53).
5. Using socket J–29873, remove injector and gasket from
cylinder head.
CAP
FUEL RETURN HOSE
Figure 3-52: Rear Injector Fuel Cap Location
Installation
1. Apply antiseize compound to threads of new injector.
2. Install gasket and fuel injector in cylinder head. Tighten
injector to 44-60 lb-ft (60-81 N•m).
3. Connect fuel line to injector. Tighten fuel line to 20 lb-ft
(27 N•m).
4. Install injection line bracket and clamp.
5. Install fuel drain hose and cap.
6. Connect drain hoses to injectors.
7. Start engine and bleed injectors.
8. Install console and cover.
5745159
REAR INJECTOR
Fuel, Emissions, and Exhaust
INJECTOR
GASKET
FUEL INJECTOR
Figure 3-53: Fuel Injector and Gasket Removal/
Installation
Injection Line Replacement
Removal
1. Remove injection pump boot.
2. Disconnect injection lines at injectors (Figure 3-54).
INJECTION
PUMP
FUEL INJECTORS
Figure 3-54: Fuel Injection Line Routing (Typical)
3. Remove injection line brackets.
NOTE: Tag fuel injection lines by cylinder number for instal-
lation reference.
4. Disconnect injection lines at pump.
5. Remove fuel line clamps.
3-37
INJECTOR LINES
INJECTOR LINES
CLAMP