HP Fuel Injection Pump (Fuel delivery system - Td4)

The fuel tank is located on the underside of the vehicle, forward of the rear suspension subframe. The tank is constructed from moulded plastic and is retained with a tubular cradle which is secured to the vehicle floorpan with four bolts. The tank has a capacity of 60 litres (13.2 gallons).

A reflective metallic shield protects the tank from heat generated from the exhaust system on the LH side and a fire shield is located on the RH side.

An aperture in the top surface of the tank allows for the fitment of the primary LP fuel pump. The pump is secured with a special locking ring and is sealed with a rubber seal ring.

The fuel tank filler is located on the RH rear wing panel and is protected by a lockable cap. The plastic tube from the filler is connected to the tank by a flexible rubber tube and secured with clamps. A small diameter vent pipe allows air and vapour displaced by the fuel to escape to atmosphere during filling of the tank.

The tank incorporates a Roll Over Valve (ROV) to allow vapour in the tank to escape to atmosphere. The tank must not be over-filled to ensure that a vapour space above the fuel level is maintained which allows the tank to 'breathe'. The ROV is welded onto the top surface of the tank and is vented to atmosphere near to the filler cap via a pipe. During normal operation the ROV is open allowing vapour to pass to atmosphere. In the event of the vehicle being overturned the ROV shuts-off, sealing the tank and preventing fuel flowing down the vent pipe.

HP Fuel Injection Pump

4

3

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13

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12

M19 3264

1 Drive shaft 2 Cam 3 Piston 4 Chamber 5 Inlet valve 6 Pressure valve 7 HP supply to fuel rail

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11

8 Pressure control valve 9 Ball valve 10 HP return 11 LP fuel supply 12 Safety valve with throttle bore 13 LP fuel gallery

The high pressure fuel injection pump is located on the front right hand end of the engine and is driven via a chain from the crankshaft. The pump has a variable output which is controlled by the ECM via a pressure control valve. The ECM maintains the pump output pressure to the fuel rail at a level appropriate to the current operating conditions. The output pressure is measured by a pressure sensor located in the end of the fuel rail.

The pump receives a fuel supply from the fuel filter which is supplied by the primary and secondary LP pumps at a pressure of approximately 2 to 2.4 bar (29 to 35 lbf/in²). This pressure is controlled by the pressure relief valve.