ISC, ISCe, QSC8.3, ISL, ISLe3, ISLe4 and QSL9 Engines – Fuel in the Sea Water

Symptom Tree  t90

This is symptom tree t90
Cause Correction

Fuel return restriction excessive

Inspect the fuel return lines for restrictions. Refer to Procedure 006-012. Check to make sure the fuel return valve is open.


Fuel cooler is malfunctioning (if equipped)

Check the fuel cooler. Refer to Procedure 006-062 for QSL9 marine sea water cooled engines or Procedure 008-129 for QSC8.3 marine engines.

Last Modified:  20-Jun-2005