Finally got the fuel starvation problems fixed on the R795. After running out of fuel several times with the tank containing the pickup full, replacing the fuel lines, fuel filters, and "kitting" the xfer pump, it was still sucking the fuel out of the secondary filter, then starving out. Same story time and time again, primary filter, (red) is full, the secondary filter, (green) is damned near bone dry. After removing the filters and filling the green one several times, I installed another pair of filters, and the problem went away. Trying to figger what the difference would make when the other filters never left the shop when running, I get a spare remote filter head, plug the threaded ports for the hoses to attach to with the exception of the inlet port, apply five psi to the inlet port and submerge the assembly in the parts washer. Lo and behold this sucker is bubbling rapidly at the crimp of the shell to the base! This could explain why I could pull fuel from the secondary filter but not from the primary. I feel like I look, (dumbass) for spending so much time chasing after something so seemingly simple. These are Mack branded filters so I'll run over to the dealer and get them replaced as defective. The truck now once again runs very sharp and crisp to throttle response. Maybe it will stay that way a while. Rob