Gasoline engine fuel system Opel Omega A

Fuel system specifications
For models of later model years, see Appendix at the end of the Manual ( Section 13 ).

General description of the fuel system
The fuel system consists of a rear-mounted fuel tank, a mechanical or electric fuel pump, and a downdraft carburetor or Bosch fuel injection system. The fuel...

Ongoing maintenance
1. Perform the following procedures at the intervals given in Section « Maintenance » at the beginning of this guide. 2. Replace the air filter element as...

Plugged adjustment screws — general description
Some Adjustment Points (where available) in the fuel system are protected by plugs. Plugs are designed so that an incompetent motorist does not get to the...

Air filter and element — removal and installation
Carburetor models 1. Disconnect the air intake duct and warm air duct from the air filter. 2. Loosen the three mounting nuts, lift the air filter off the...

Fuel pump (carburetor models) — removal, inspection and installation
1. The fuel pump is located on the front right side of the camshaft housing. 2. Tag the fuel inlet and outlet hoses, then loosen their clips and disconnect...

Fuel pump (models with fuel injection) — check, removal and installation
1. Depending on the model, the fuel pump can be installed inside the fuel tank, or separately in front of the fuel tank (photo). 2. To check its operation,...

Fuel Filter (Fuel Injected Models) — Replacement
1. Block the front wheels, then jack up the rear of the vehicle and support it on axle stands. 2. Install the clamps on the fuel filter inlet and outlet hoses....

Fuel tank — removal and installation
Note: For safety, the fuel tank must be removed in a well-ventilated area, never over a pit. 1. Disconnect the negative battery cable. 2. Remove the filler cap...

Fuel level sensor — removal and installation
1. Disconnect the negative battery cable. 2. Remove the filler cap and pump out all the fuel. 3. Block the front wheels, then jack up the rear of the vehicle...

Diaphragm damper (engines with fuel injection) — removal and installation
1. Block the front wheels, then jack up the rear of the vehicle and support it on axle stands. 2. Install clips on each side of diaphragm damper. 3. Loosen...

Accelerator cable — removal, installation and adjustment
1. On carbureted models, remove the air filter (Chapter 4), then manually open the throttle and disconnect the inner cable from the grooved cam. 2. On models...

Fuel control pedal — removal and installation
1. Disconnect the accelerator cable from the pedal as described in Chapter 11 . 2. Remove the spring clip from the inner edge of the swing arm, remove the...

Carburetor — description
The Pierburg 2E3 carburetor contains an electrically controlled automatic choke. It has a dual chamber design with progressive throttles. The primary throttle...

Carburetor — idle and mixture adjustment
1. Tachometer (revolution counter) and exhaust gas analyzer (CO meter) required for fine adjustment. 2. The adjustment must be made with the air filter...

Carburetor — removal and installation
1. Disconnect the negative battery cable. 2. Remove the air filter as described in Chapter 4 . 3. Drain the liquid from the cooling system ( Section 2 ) or...

Carburetor — Bulkhead
1. Drain the fuel from the vapor separator and float chamber. Clean the outside of the carburetor. 2. Remove hoses and wires from carburetor, making marks to...

Carburetor Throttle Damper (Automatic Models) — Adjusting
1. Adjust idle speed and mixture as described in Chapter 14 . 2. With the throttle lever in idle position, loosen the jam nut on the damper and adjust the...

Carburetor — High idle adjustment
1. The engine must be warmed up to operating temperature, the idling speed and the mixture must be properly adjusted. 2. Place the fast idle adjustment screw...

Carburetor thermostatic valve — check
1. Remove the air filter ( Chapter 4 ). 2. Disconnect the wire connector from the valve. Turn on the ignition and check with a voltmeter that the supply...

Intake manifold heater element (carburetor models) — removal, inspection and installation
1. The heater element is located below the intake manifold. Disconnect the wiring first. 2. Turn off screws and get an element from an inlet collector. Remove...

Fuel injection system — description
1.8 models are equipped with Bosch L3 Jetronic fuel injection system, 2.0 models are equipped with Bosch Motronic ML4 engine management system. Both systems...

Fuel Injection System — Precautions
The fuel injection system is usually trouble-free. Avoid damage to electrical components by observing the following precautions: (a) Do not disconnect the...

Fuel injection system — idle speed and mixture adjustment
Note: On the Motronic system, only idle mixture adjustment is possible, since the idle speed is controlled by the idle speed controller. 1. Start the engine,...

Fuel Injection Throttle Switch — Check and Adjust
1. Disconnect the wires from the throttle switch (photo). 2. Connect an ohmmeter to the center clamp (18) on the switch and in turn to each of the external...

Components of the Bosch L3 Jetronic fuel injection system — removal and installation
Note: In the event of damage, the major components of the fuel injection system should be diagnosed by a GM dealer or other person who has the necessary test...

Bosch Motronic ML4 fuel injection system components — removal and installation
See the remark given in Chapter 25 . Throttle switch 1. See Chapter 25 paragraphs 1-3 . Fuel injectors 2. Disconnect the negative battery cable. 3. Disconnect...

Drive Speed Control System — General Description
The speed control system is installed only on some models. It consists of an electrically controlled motor (photo), which controls the throttle by means of a...

Intake manifold — removal and installation
1. The manifold can be removed with or without fuel injection or carburetor components. Remove the air filter first (carburetor models), or disconnect the air...

Exhaust manifold — removal and installation
1. Disconnect high voltage wiring from spark plugs and ignition coil. 2. Remove the bolts securing the exhaust pipe to the exhaust manifold, lower the...

Exhaust system — removal and installation
1. The exhaust system consists of three parts, each with its own muffler, except for the front pipe on carbureted models. 2. To remove the complete system,...