[KingLT1]

If you have the fuel system module licensed go into the sytem/general/ fuel system minimum and up the voltages from 14.7 to 15.5 from about 159 lb/hr on up.

Next set the Diag System Voltage low to 12.5v.

Then go to fuel system/fuel pressure/ Normal and set it to 50.8psi.

See if that helps your low side out.