I have a N14 460 in a 2001 Western Star. The last few times starting it took progressively longer to start. The last two times starting we had to give it a shot of either to get it to start before the batteries died. Since then we have installed a new starter because it tested weak. Now it seems to turn over well but still no start. the ECM has power and ground. I am getting a reading off the crank sensor when it is turning over (based off of my blue point scanner). Fuel shut off has 12V at the wire when key is on. Pressure tested the pump and was only getting 18 psi out if the port behind the fuel shutoff solenoid. Was told I needed at least 75 psi to start the truck and 140 running so I installed a new pump. Still no start. What am I missing. All Fluids are topped off. Filter is new. Thanks in advance for any help.