Well JOAT1980, I can't vouch for the CPS as I don't have enough experience with the 7.3. But it does sound like it could be a lift pump/filter issue as I've experienced that 1st hand.
Regarding the blended wvo, I and several associates have seen that 1st hand as well, and it works fine. In my experience running blend in my Cummins, up to 370K miles, saved me ALOT of $$, oh yea, helped the environment as well
dse in truck 04-05 CTD - TDR Roundtable
It's a long thread, but get through the whole thing. I think Craig has over a couple hundred miles on blend as well. Tom.