CAT 302.5 engine problem

[TaskForceOne]

I have a CAT 302.5 with a 3013 engine, Prefix: 4AZ04565. The machine runs excellent for about 20 min then it will smoke a little blue/white, lose power, and run rough. The smoke smells like fuel. If I prime it a few times it will smooth out so I'm thinking it is a fuel starvation issue. I have replaced both fuel filters, replaced all fuel lines, drained and cleaned the tank, cleaned out the pickup tube and return tubes, and disassembled/ cleaned the lift pump. Nothing has changed what it is doing. Is anyone familiar with these machines or this problem?

Any help would be appreciated!

 

[heymccall]

Take this ENTIRE assembly apart and flush the inlet passage out.

 

[TaskForceOne]

Ill try this next, thanks!