Main dosing system (Mazda Familia BF)

Fuel is supplied through needle valve 1 to the float chamber, in which float 2, mounted pivotally on an axis, maintains a constant fuel level in the chamber.

From the float chamber, the fuel enters the emulsion well through the main fuel jet 3. When the throttle valve of the 1st chamber is open, a vacuum is created in its sprayer, under the action of which the fuel in the emulsion well rises and mixes with the air coming out of the hole of the emulsion tube, made integral with the main air jet 4. Through the sprayer 5, the fuel-air emulsion enters the diffusers and then into the mixing chamber of the carburetor.

When the throttle valve of the 2nd chamber is open, the operation of the main metering system of the 2nd chamber occurs in a similar manner.

The throttle valve of the 2nd chamber opens when moving under the action of the vacuum of the diaphragm of the pneumatic drive 24, which is connected by a rod to the throttle valve 10 of the 2nd chamber. Due to the presence of a mechanical lock, the throttle valve of the 2nd chamber can open only when the throttle valve of the 1st chamber is open and the engine is warmed up.

Based on website data Mazbook.ru