^^^ Spelling, sentence structure including punctuation, and paragraphs would make this much easier to read.
Okay I have not put in my o2 sensors. But I have got them just need to weild them in
Of course you mean "weld in threaded bungs that the O2 sensors will screw into". Welding the body of the sensor to the exhaust pipe is flat-out insane.
Weld the bungs into the top-half of the exhaust pipe, so the sensors kinda point "down" in use. They need to be positioned just like OEM. Use anti-seize on the O2 sensor threads.
I have oem ones from parts truck.
Re-using O2 sensors is not a good idea. They get lazy with age--slow to respond.
But my file pressure is misleading me. Key on engine of -51psi then drops immidsntly to 47psi. Engin on at idle is 43psi . 60 mph it’s stays around 45-50 psi. Even when I floor it but truck drives fine like this.
Is your fuel pressure gauge accurate? I bet it reads low.
Your fuel pressure is so low I'm surprised you can get the engine to start and run if you still have the poppet injectors. The electronic injector "upgrade" spider would be less-sensitive to low fuel pressure.
When you have the scan tool connected, verify your fuel trims.
I only have problems when I let engine get cold over night and come and try to start it. It does it when it’s hot or cold out side.
Connect scan tool, verify ALL the sensors. In particular, the coolant temp sensor, and the throttle position sensor.
I have a snap on scanner with me and can’t find it.
Keep looking, it's probably in a bigass black-plastic suitcase with all the accessories and connectors.
if I have the truck running and unplug the fuel pump relay how come I don’t loose any pressure. And truck didn’t cut off.??????
Because the oil-pressure switch acts as a bypass for the relay. Either one--relay or switch--can run the fuel pump.
If the relay works, the switch could malfunction and you'd never know the difference. If the relay malfunctions, you'd have to crank the engine a long time to get oil pressure, which closes the oil pressure switch contacts, which turns on the pump. Once the engine cranks long enough to have oil pressure, the pump would run just fine.
Your truck has low fuel pressure during prime--which may be a defective pressure gauge--but the fuel pump relay circuitry is working. The truck still runs when the relay is removed--so the oil pressure switch and wire harness is OK.