I have swaped a flex fuel pump out of a 2013 turk into my non flex fuel truck. It seems as I might be having fuel pressure issues... I swaped the FPCM as well but it was from a 2011 flex fuel. Has anybody had this issue befor after swaping pumps?

 

Ok so everything is working but it seems like I am getting changing fuel pressure at steady rpm and speed. Any one else ever had this issue? I thinking it might be tied into a sensor possibly MAP or MAF?