Fuel delivery system - K Series KV6 (Description): Description and operation

Description

General

The fuel delivery system consists of a fuel tank containing an electric fuel pump to supply fuel at a constant pressure to the engine fuel rail. A pipe, routed along the underside of the vehicle, connects the fuel pump to the fuel rail.

Fuel Tank

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 by a tubular cradle which is secured to the vehicle floorpan with four bolts. A heat shield is installed on the LH side of the support cradle to protect the tank from heat radiated by the exhaust system. A fire shield is installed on the RH side of the support cradle.

The fuel tank has a nominal capacity of 60 litres (15.85 US gallons). An aperture in the top surface of the tank allows for the fitment of the fuel pump.

The top of the fuel tank filler tube is located in the RH rear wing panel and is closed by a lockable filler cap. The bottom of the filler tube is connected to the tank by a flexible tube secured with clamps. On NAS vehicles, a flap valve in the fuel tank, at the connection point with the filler tube, prevents vapour from escaping once refuelling is completed and also prevents fuel from escaping if the filler cap or filler tube are damaged in an accident.

On all except NAS vehicles, a vent pipe between the tank and the neck of the filler tube allows air to escape from the tank during refuelling. With the fuel filler cap installed, the tank is ventilated to atmosphere through vent pipes that connect three roll over valves in the tank to the Evaporative emissions (EVAP) system. EMISSION CONTROL - K SERIES KV6, DESCRIPTION AND OPERATION, Description.

On NAS vehicles, during refuelling and with the fuel filler cap installed, the tank is ventilated to atmosphere through vent pipes that connect an Onboard Refuelling Vapour Recovery (ORVR) valve and the three roll over valves in the tank to the Evaporative emissions (EVAP) system. EMISSION CONTROL - K SERIES KV6, DESCRIPTION AND OPERATION, Description.

The location of the vent pipe connections on the fuel tank ensures an air space remains in the tank after filling, to allow for heat expansion of the fuel.

The ORVR valve and roll over valves are float valves that prevent fuel from entering the EVAP system vent pipes due to fuel slosh or if the vehicle overturns.