Jet Pumps

The two modular fuel pumps are immersed in the base of the fuel tank. The pumps can deliver up to 150 litres / hour. The in-tank fuel lines connect to the external lines using two quick-fit connectors in the base of the fuel tank.

During normal running, pressurised fuel from each fuel pump passes from the tank, through an 3 micron in-tank fuel filter to one of the two fuel rails on the engine.

Fuel temperature is measured on the primary fuel rail. If fuel temperature becomes excessive, the fuel pressure is increased to prevent fuel vaporisation (boiling).

Fuel pressure is measured by sensors on each fuel rail. The fuel pressure to each rail is regulated as required by continuously changing the run speed of the associated fuel pump. Maximum pressure in the system is limited to 5.3 bar by in-tank pressure regulators.

A constant head of fuel is maintained in the fuel pump modules to ensure that the pumps cannot run dry in a ‘low fuel’ situation.

Jet Pumps

Fuel feed from the fuel pumps is split three ways:

1. Feed to the fuel rails.
2. Feed to the swirl pot jet pumps (integral to the FDM).
3. Feed to the externally mounted jet pumps.

These pumps ensure that the appropriate pump swirl pot is maintained with fuel under severe dynamic conditions.