Fuel pump

FUEL PUMP

OPERATION

General

One side of the fuel pump relay coil receives battery voltage from fuse A4 in the passenger compartment fuse box on a W wire provided the starter switch is in position II. The other side of the relay coil receives an earth on a BP wire from the MEMS control unit provided the correct operating conditions exist, (see Engine Management System) causing the relay to energise.

The energised relay switches battery voltage from link 4 in the engine compartment fuse box on an N wire, via fuse C7 in the passenger compartment fuse box to the inertia fuel shutoff switch on an NS wire. Provided the inertia fuel shutoff switch remains closed, battery voltage is fed on a WP wire to the fuel pump. Since the pump has a permanent earth on a B wire it will commence operation.