IFI Fuel Supply Task/Design/Function

Design
Shown on engine 605

Task
Supplying an adequate quantity of filtered fuel from the fuel tank and at an adequate pressure of the inline injection pump (10) in all operating conditions.

Function
When the engine is started or is running, the fuel flows through the components stated below to the suction chamber of the inline injection pump (10):
- fuel tank (80)
- fuel heat exchanger (60)
- fuel prefilter (70/1)
- IFI electrohydraulic shutoff (Y1/1)
- fuel pump (13)
- fuel full-flow filter (70/2)
- IFI electrohydraulic shutoff (Y1/1)
- inline injection pump (10)

The excess fuel supplied by the fuel pump (13) flows from the suction chamber of the inline injection pump (10) through the overflow valve (15) into the return flow pipe (90/3). The leak fuel from the injection nozzles (50) likewise flows into the return flow pipe (90/3) and flows back from their pressureless to the fuel tank (80). As a result of this circulation, the fuel available for the inline injection pump (10) is always relatively cool.