Fuel Pump & Relay

Roller-cell fuel pump assembly, with damper at suction end, is found in several locations in vehicle depending upon manufacturer. Fuel pump relay activates fuel pump during starting and with engine running. It also switches off fuel pump in absence of TD signal from ignition control unit and provides voltage supply for oxygen sensor heating.

On Coupe GT and 4000S, pump, accumulator and filter are located in right rear area. On 4000S Quattro, pump, accumulator and filter are located in left rear area. On 5000S, fuel pump is located in fuel tank underneath sending unit; gravity vent valve is incorporated into sending unit.