i have a 95 f 250 dide on the highyway and would not start pluged in to it and it says im bulding no high presure oil but i also found a burnt injector harness would that cause it not to build presure

 

IPR O ring is a cheap test . May also be simply the CPS .

 

Try unplugging the ICP sensor and starting.

 

there are a whole host of connectors to try.

ICP unplug would be the first to try.

looking at the engine from the front, its right of the fuel bowl on the head.
Unplug it and try again.

Take note if the Tachometer is moving in the truck also when you crank.
if tach isn't moving, you have a CPS problem.

The IPR is a bit harder to check as its down in front of the fuel bowl under some stuff.
but if you look down there, there should be a little visible nut on the right side of the fuel bowl down below between the big block thing at the front of th emotor and the fuel bowl.
It's a tin nut.
Reach down there with your hand and make sure its snugged up tight.
the connector for that is right on top of that sensor, check its plugged in tight.
The connector for that connector is on the side of the fuel bowl.

check that one too.
And on top of that.
There is a fuse to check as well, somebody can chime in with what number it is.
Its for the fuel bowl heater and will strand you as well and not let the truck start.
That one just requires a fuse replacement and unplugging the fuel bowl heater. Which i forget which one it is, cause i gutted mine years ago.