Looks like your fuel pressure should be a right around 30 psi according to your fuel pressure, regulator part number, item number, 15, https://www.mercruiserparts.com/bam/subassembly/31953/5725/80
https://www.mercruiserparts.com/mx-6-2l-mpi-bravo-0l680003-thru-0m2999
Your engine should be more...