Fuel Injectors & Pumps

Section 8.11 MBE 900 Injector Leak Test

Section 8.11
MBE 900 Injector Leak Test

Remove the engine trim panel. See current MBE 900 service manual (6SE414).‪

  1. Disconnect the fuel temperature sensor.
  2. Plug the disconnected fuel temperature sensor into the engine wiring harness and tie it up out of the way.
  3. Install the adaptor and seal from the fuel adaptor parts kit (J-46377) .
  4. Attach a banjo fitting to the adaptor, and use that to connect the high-pressure fuel line (J-46372) and gauge (J-46378) .
  5. Disconnect the fuel return line at the main filter housing. Seal the opening with a cap.
  6. Disconnect the fuel feed line and feed line fitting at the main filter housing. In their place, attach the hose with a banjo fitting and the shut-off lever from the fuel adaptor parts kit (J-46377) .
  7. Open the fuel fill cap to release pressure in the fuel tank.
  8. Fill the low-pressure fuel circuit with compressed air until the fuel pressure on the high-pressure gauge reads 1000 kPa (145 psi).
  9. Turn the shut-off lever to the OFF position and wait five minutes.
  10. At the end of five minutes, read the pressure on the gauge again. The gauge should read at least 975 kPa (141 psi). If the gauge pressure is too low, see the causes listed in troubleshooting table in current service manual.
  11. Check the engine oil for presence of fuel. If there is fuel in the engine oil, see the causes in troubleshooting table in current service manual.
  12. Open the shut-off valve and remove all the test equipment. Connect the fuel feed and return lines, as removed. Reconnect the fuel temperature sensor.
  13. Make sure the fuel fill cap is tightly closed and the vehicle has been restored to operating condition.


Unit Fuel Injectors and Unit Pumps Technician's Guide - 7SE500
Generated on 10-13-2008

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