Power supply system characteristics (BMW 3 Series E21)

Fuel tank

The fuel tank is stamped from sheet steel. It has two sections and is mounted under the rear seat in front of the rear axle.

Fuel tank capacity, l: 58.

Brand and type of drain valve for cars with carburetor engines: PE 20 439.

Fuel pump

On cars with carburetor engines, a mechanical diaphragm-type fuel pump of the Pierburg brand is installed, driven by a pusher from the intermediate shaft.

Pump performance at crankshaft speed of 4000 rpm, l/h, not less than: 55.

Fuel supply pressure at crankshaft speed of 4000 rpm, kg/cm²: 0.21-0.30.

Pusher length, mm: 36.

Thickness of the heat-insulating spacer assembled with the gasket, IM-201 0.15.

On vehicles with fuel injected engines, an electric fuel pump is used, see. "Injection system".

Air filter

Air filter - with replaceable dry filter element.

Brand and type: "320": Purolator PH 1680 or Mann C 4 190; "323i" Purolator PM 1645.

Carburetor

The engine of the model "320" automobiles is equipped with an OVG (Solex) 4A1 emulsion type carburetor, two-chamber, with sequential opening of throttle valves, with an automatic starting device and a thermostatic auxiliary starting device (to start a warm engine). At forced idle speed, the forced idle economizer is activated. Carburetor type according to the DVG catalogue E 17 603.

BMW catalogue number 1 266 255.

Colour of the nameplate: blue.

Calibration data for Solex 4A1 carburetor

Solenoid shut-off valve

Brand and type: Pierburg PE 20 273.

Valve needle stroke, mm: 2.5±0.05.

Nominal voltage, V: 12.

Maximum allowable voltage, V: 16.

Current consumption at terminal voltage of 12 V, A: 0.25±0.02.

Vacuum regulator: Brand and type: Pierburg PE 20 464.