Vedeneyev M-14P, Maintenance Manual

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FUEL SYSTEM - DESCRIPTION AND OPERATION
1. GENERAL
The engine fuel system comprises a fuel pump, a fine fuel filter, a carburetor and interconnecting pipelines.
During operation of the engine the fuel pump supplies fuel from the fuel tanks through the filters to the
carburetor from which the fuel-air mixture is fed to the engine blower.
On passing the blower, the mixture collector manifold, intake pipes and inlet valves, the mixture gets to the
engine cylinder combustion chambers.
2. DESCRIPTION
The 702ML rotary vane-type pump supplies fuel (gasoline) at excessive pressure for normal
o operation of the carburetor. Fuel pressure at the carburetor inlet is 0.2 to 0.5 kgf/cm
o at operating ratings and not below than 0.15 kgf/cm at a minimum rotational speed.
The fuel pump is attached to the lower flange of the oil pump housing by four studs. The pump rotor is
driven through a square shank entering a square hole in the oil pump shaft.
To obtain the combustible mixture the fuel fed to the engine should be atomized and mixed with air.
The process of preparation of the mixture is called carburation, while the unit adapted for it is carburetor.
The AK-14P carburetor prepares the fuel-air mixture at all ratings and attitudes of the
airplane.
As regards the operating principle of the main metering system, the AK-14P carburetor belongs to draft
type. It has a membrane-type constant level chamber and is, therefore, called a floatleas carburetor.
Fuel fine filter 8D2.966.064 is intended to filter off mechanical impurities over 36 to 40
µ
m in size.
The filter is of a sump type.