Power System Specifications (BMW 5 Series E12)

Fuel tank

The fuel tank is stamped from sheet steel. It is installed at the rear right under the bottom of the luggage compartment.

Fuel tank capacity, l:

• "518", "520": 56;
• "520i" 56 in standard version, 70 8 in special version;
• "525", "528": 70.

Fuel pump

On models "518", "520", "525" and "528" uses a mechanical fuel pump, "520i" - an electric fuel pump. Fuel pump of cars models "518" and "520" Mechanical fuel pump of diaphragm type with a drive from a pusher.

Brand and type: Pierburg PE 16615.

Fuel supply pressure at a crankshaft speed of 4000 rpm and a closed needle valve, kg/cm²: 0.30.

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

Pump pusher length, mm: 88.2±0.1.

Pump pusher diameter, mm: 8^-0,080_-0,012.

Thickness of thermal insulation spacer with gasket, mm: 20.

Fuel pump for 520i cars.

Electric fuel pump - roller type, electric motor - with permanent magnet.

Brand and catalog number 0 580 364 002.

Discharge pressure, kg/cm²: 2.

Productivity, not less than, l/h: 110.

Nominal voltage, V: 12.

Working voltage. V: 7-15.

Electric motor power, W: 56.

Fuel pump for cars of models "525" and "528"

Solex brand mechanical fuel pump with a different type of diaphragm and pusher drive.

Fuel supply pressure at crankshaft speed of 4000 rpm, kg/cm²: 0.21-0.25.

Pump capacity, l/h:

• at 1000 rpm: 75-76;
• at 6000 rpm: 89-94.

Pusher length, mm: 106.2±0.1.

Thickness of thermal insulation spacer with gasket, mm: 20.

Notes

1. Since the 1978 model year, the BMW "525" and "52B" were equipped with a Pierburg diaphragm fuel pump with mechanical drive, type ZE 20.266, with a mesh filter, driven by the camshaft via a tappet. Performance at a crankshaft speed of 4000 rpm, not less than, l/h: 60. Brand and type of electromagnetic jet: Pierburg ZK 12946.



2. Since the 1980 model year, the BMW "528i" and "535i" were equipped with an electric fuel pump from Bosch, catalog No.0 580 464 013. Discharge pressure, not less than, kg/cm²: 2.8. Pump capacity, not less than, cm³/min: 1500. Current consumption, A: 6.5.

3. Since the 1982 model year, the BMW "525i" and "528i/E28" were equipped with an electric fuel pump from Bosch, part number 0 580 464 013, with the same characteristics as the previous pump, except for the injection pressure, which was 3 kg/cm³.

Fuel pump for 520i 6-cylinder vehicles

Electric fuel pump by Bosch, part number 0 580 254 980.

Adjustable discharge pressure, kg/cm²: 5.0.

Pump capacity, cm³/min: 1800.

Current consumption, A: 10.

Air filter

Air filter - with replaceable dry filter element.

Brand of replacement filter element:

• "518", "520": Purolator RM 1129;
• "525", "528": Purolator RM 1027 (Microstar AG 2/1).

[Read the original source on the website BMWMan]