All Classified forums require a Site Supporter subscription. It is only $25 per year and you can buy and sell whatever you like on the forum. To become a Site Supporter, go to Your Profile and select "Paid Subscriptions."
Did you check the ECM B fuse?
The OPS will only keep a currently running engine running. If the FPR isn't working and the vehicle isn't currently running, you won't be able to start it.
That jumper wire completely bypasses your fuel pump relay, so the problem has to be between the relay and your battery. Circuit 450 off of the relay is black w/ white and is a ground for the coil side of the relay, the part the controls the switching on and off of the power. Make sure you have a good ground there. Circuit 440 is Orange and provides power to the fuel pump. It should have 12 V. I am not sure if it is there all the time or if it is there when you turn the key on, but it comes through the ECM. Circuit 120 is Gray and goes to the fuel pumps, so we know that one is working. Last is Circuit 465 which is Green w/ White. This is the control circuit coming from the ECM. It is a signal from the ECM to turn on the fuel pump. This should have 12 V briefly when you first turn the key on. It should run the pumps for a few seconds.I would think that you should be able to get your truck to run if you jumper to the fuel pump prime wire and then try to start it. Once it fires, if you remove that jumper wire and it keeps running, then the Fuel Pump Oil Pressure Switch is doing its job and keeping the truck running in the case of a failed relay, but you did say you replaced the relay.If you are getting power to the relay and you have a good ground to the relay, then I would think something is wrong with the control circuit from the ECM.