This is turning epic.. This is my first Diesel and I bought a Cummins because of its reputation, but now I'm having regrets..
My truck has thrown the P0191 code since I bought it 3 months ago.. only has 82,000 miles.. so far I have done...
*new fuel sending unit
*new fuel pressure regulator
*plug in relief valve
*new Fleece HP fuel pump
*cat fuel filters
Then I take to dealer.. they said it needs reflashed..Ok they reflash it, next I get a lighting bolt and code for throttle, and a communication computer code.. Dealers says I have a faulty PCM.. Geeze, $1800.00 for new PCM and files etc.. Latest updated programming.. I drive off lot and it throws a code for #1 injector.. Took it back, dealer said it needed flashed again a file didn't load.. Ok reflasehed again.. Picked up again drove home again and P0191 code is back.. WTF..

Any ideas before I invest in C-4 ???