You need to slow down on the 6.0L advice ................. !!Fuel pump and filter one assemble unit mounted under the truck near frame . And there is a modes fuelpump filter kit can do the same. Also check the ICP Sensor located in the driver side of head on the engine . Those tend to go bad after awhile. Check your fuel bowl on the engine remove the fuel bowl cap off with a I believe it's a 22mm socket or a 24mm . Turn ignition key in run position look to see if fuel is over flowing the fuel bowl . If so then fuel pump and filter is ok, as that is the high oil test . Next is the low oil pressure check . Check your engine oil if up to level . if not then perhaps have a engine oil leak somewheres . Or a relay switch not working properly.
Check next would be FICM. Hope this info helps.
You have the ICP sensor location wrong, and what in the world are you calling the "high oil test" in the same sentence as a fuel pump test?
Thank you for looking up the correct location of the fuel pump and primary fuel filter at least!