A. fuel supply circuit

The Bosch Motronic M2.7 injection-ignition system is made up of four interdependent circuits

A Fuel supply circuit

B Air intake and turbocharging circuit

C Electric/electronic circuit

D Circuit for checking harmful exhaust emissions

Two devices and their circuits strictly related to the injection system are also present. These are also designed to reduce vehicle harmful emissions in line with USA '83 standards. These are as follows: fuel evaporation control and vapour recovery circuit; crankcase vapour recirculation and recovery circuit.

A. FUEL SUPPLY CIRCUIT

This consists of the following parts:

1. reservoir
2. pump submerged in tank
3. mesh prefilter on pump intake
4. paper main fuel filter
5. outlet line
6. four injectors
7. fuel pressure regulator
8. return line with one-way recirculation valve or anti-reflux valve
9. vacuum point for fuel pressure regulator
10. inertia safety switch

This system also incorporates an electrical device for injector cooling