Fuel pressure problem..I'm at a loss.

the bypass fuel filter will also cycle the fuel in the supply lines to prevent the lines from getting hot enough to vaporize the fuel. They will be (always flowing) liquid cooled. The space shuttle rocket motors used something similiar, used the super cooled fuel to cool the nozzles by pumping it through the nozzle walls prior to burning it. They factored in a few of the lines bursting (eg. 28) and on one mission they counted 26 lines failed on the post flight check. If 28 burst the sensors would have picked up a dip in fuel pressure and that engine would have shut itself down and most likely would have aborted that mission.