Secondary Pump Secondary Pump The secondary fuel pump is located on the side of the fuel tank. The pump is an inline electric pump and boosts the fuel pressure for delivery to the High pressure pump. The pump is activated at the same time as the electric fuel pump by the ECM controlling the fuel pump relay. High Pressure Fuel Injection Pump The high pressure fuel injection pump is located at the front of the engine and is driven by a chain from the crankshaft. The pump has maximum delivery pressure of 1350 bar. The high pressure pump is the interface between the low pressure and the high pressure fuel systems. The pump has the task of ensuring that there is always enough fuel delivered at a sufficient pressure in operating conditions over the entire service life of the vehicle. This includes the delivery of spare fuel, required fora rapid start and pressure increase in the fuel rail.