Carburetor

Fuel And Emission System Layout:

Fuel Delivery System Layout (B2200 W/Feedback Carburetor):

The Mazda B2200 truck is available with a 2.2 liter, 4 cyl. gasoline engine with either a feedback carburetor fuel system or electronic fuel injection. This section covers the feedback carburetor system.

The carburetor is designed to keep the air/fuel mixture as close as mechanically possible to the ideal stoichiometric ratio, under most conditions. To further regulate the air/fuel mixture, the carburetor incorporates an electrically operated air/fuel solenoid that is computer controlled. The air/fuel solenoid is alternately turned ON and OFF several times each second to either restrict fuel flow (in the case of a rich condition) or to increase fuel flow (in the case of a lean condition). The signal to the solenoid (duty cycle) varies depending on the signal from an oxygen sensor located in the exhaust gas stream. The carburetor also incorporates other electrical solenoids to further modify the air/fuel mixture, depending on the immediate demands of the operation conditions.

All the primary fuel and air handling components are covered under this category. For more information regarding electronically controlled devices, the computer, and its functions, refer to COMPUTERIZED ENGINE CONTROLS.

The fuel and intake system consists of the following:

Accelerator pedal and cable
Air cleaner, intake air ducts and associated parts
Carburetor with associated solenoids and vacuum devices
Fuel tank
Fuel pump
Fuel filter
Fuel lines
Intake manifold