2006 2.3 hpi iveco?

These may help.

Sounds like a fuel pump / regulator / sensor issue. You could try these forums yourself

http://ivecoforums.com/topic/8868209/1/

http://www.bba-reman.com/forums/Topic106941.aspx

http://www.indeed.com/forum/job/diesel-mechanic/iveco-engine-identification/t32325/p13

Gladys
January 2015