2005 Mazda B2300 Loss Of Fuel Pressure

My truck stopped running one day on an exit from the highway. I hit the fuel reset and had to wait several minutes before it would start. I have replace the fuel pump and it still didn't start. I had pressure so I tested and replaced the spark plugs. I then went to start the truck and found that it would still not start. I released all the fuel pressure and tried again on the off chance that the fuel wasn't pressurizing and found that it wasn't. I check the fuel cutoff switch and found that it had shorted, so I bypassed it and I am still not getting pressure. I can hear the pump try to prime, but it won't build pressure. I also checked all the fuses and relays. Any help would be much appreciated.