Series 40E Troubleshooting – Section 2.1 Fuel System Description


Section 2.1
Fuel System Description

The fuel system consists of three major subsystems:‪

  • Fuel Supply System
  • Injection Control Pressure System
  • Fuel Injector

These subsystems work together to inject pressurized fuel into the combustion chambers. The function of the fuel supply system is to deliver fuel to the injectors. The injection control pressure system supplies the injectors with high pressure oil and the Electronic Control System controls the moment and duration of the injection.‪

All three systems converge into the Hydraulically Actuated Electronically Controlled Unit Injector (HEUI).‪

The function of the fuel supply system is to deliver fuel from the fuel tanks to the injectors. The components involved in this task are:‪

  • Fuel tanks
  • Fuel supply lines
  • Fuel strainer
  • Fuel filter
  • Priming (hand) pump
  • Fuel supply pump
  • Fuel/oil supply manifold
  • Fuel passages from the fuel supply manifold to the cylinder head that feeds the injectors
  • Fuel pressure regulator
  • Fuel return lines


Series 40E Troubleshooting Manual – 6SE241
Generated on 10-13-2008