Quote Originally Posted by Dieseldude View Post
I really know. The only way to really find out is by having the injection pump and injectors checked for conformance to calibration specs. If they do, high FC could be due to engine wear, blocked air filter, timing deviation, etc.

FC is critical due to today's rising fuel cost.

Might be a good idea to service the clutch assembly/transmission system also, not that it affects FC, or would it?