Fuel pump

FUEL PUMP

DESCRIPTION

Td4

The fuel system on Td4 vehicles features two fuel pumps. A low pressure fuel pump is mounted in the plastic fuel tank, and delivers Diesel fuel to the high pressure Fuel Injection Pump (FIP). The system also incorporates a spill return line, which returns any unused Diesel fuel back to the tank. For more information on the Td4 fuel system, refer to the Fuel Delivery System – Td4 section of the System Description and Operation Workshop manual.

K Series and KV6

The electric fuel pump is mounted in the plastic fuel tank, and supplies fuel at a constant pressure to the fuel rail via a filter. The fuel rail distributes fuel equally to each of the four injectors. The system also incorporates a spill return line, which returns any unused fuel back to the tank.

For more information on the K Series and KV6 fuel systems, refer to the Fuel Delivery System – K Series 1.8 and Fuel Delivery System – K Series KV6 sections of the System Description and Operation Workshop manual.

OPERATION

Td4 General

Feed from the positive battery terminal (C0192) is supplied to fusible link 3, fuse 10, and the main relay (C0632) on an R wire. All are located in the engine compartment fuse box. Operation of the main relay (C0576) is controlled by the Engine Control Module (ECM) (C0603) on a WK wire. For more information on main relay operation, refer to the Engine Management Systems – EDC section of the System Description and Operation Workshop manual.

Fuse 10 (C0575) provides a constant battery feed to the inertia switch (C0123) and the fuel pump relay (C0730) on G wires. Fusible link 3 (C0571) provides a constant battery feed to the ignition switch (C0028) on an N wire. When the ignition switch is turned to the 'ignition' position, current flows across the switch (C0028) to fuse 6 of the passenger compartment fuse box (C0588) on a G wire. Fuse 6 (C0581) provides an ignition feed to the ECM (C0603) on a W wire.