Oil pressure high all the time - 2005 GMC Sierra

High pressure itself is not a real issue, the issue is why is it high, it can cause the filter to fail or other seals to break down, if the pressure is high because an oil path is blocked them something is getting starved from oil and will fail.. This is a common issue with jeeps and requires some serious work .

Adding fuel to the fuel tank is absolutely unrelated to to any change in engine oil pressure.
The oil pressure will be higher when the engine oil is cooler and lower when the engine oil has warmed up.

If you are experiencing abnormally high oil pressure on start up I suspect you are running the incorrect type and grade of oil in the engine. Only use the oil specification(type and grade) listed by the manufacturer for your engine and nothing else.. If you are unsure what that is then it is specified in your owners manual for the vehicle.

High fuel consumption has also nothing to do with your engine oil pressure. If you are experiencing high fuel consumption then please read and examine these factors..........................
Finding and Fixing the Causes of Poor MPG

62 is not high oil pressure (my dully runs 80 psi)
if smokes after extended driving check pvc valve (when was last time you changed the oil?)

Check to see you have oil up to full on dipstick . The high pressure pump picks up oil at the top level so if oil starts to get to low engine will stop before engine damage . The high pressure pump is what makes the injectors fire . Also check the wires that go thru valve cover some times they burn up and you can smell the burn thru the oil filler cap .

If the oil level is correct then you might be up for an oil pump. Some engines have an automatic cut-out for low oil pressure or high temperature as a safety mechanism to protect the engine from massive damage.

According to what you explain, there is some maf sensor defective or disconnected, the ferrari engine has high compression and forces the fuel to mix with the engine oil, this produces loss of oil pressure.
Check if the oil smells of fuel, check the sensor connections, also check the engine controller

P1211 Injector Control Pressure Sensor Above / Below Desired P1249 Wastegate Control Valve Performance
P1211 We all know that this code is commonly caused by "Hot Chips" that are demanding more Injection Control Pressure (ICP) than the High Pressure Oil Pump can deliver. For what it's worth, these are the exact parameters that trigger this code:

• ICP 410psi Higher Than Desired for 7 Seconds
• ICP 280psi Lower Than Desired for 7 Seconds

This code can also be caused by legitimate High Pressure Oil System issues. Below is a list of some of the causes:

• Failed or Sticking IPR (Injection Pressure Regulator)
• Failed or Weak HPOP (High Pressure Oil Pump)
• Any Leak in High Pressure Oil System (o-ring, stuck injector, etc.)
• Low Fuel Pressure (Rare)

P1249 it is the HPOP, above or below pressure, if you have added a performance chip to your vehicle , you will get this code from time to time, basically its Turbo over boost

MY 1996 VW CABRIO HAS A HIGH OIL PRESSURE THE SWITCH IS BLOING OFF AND LOOSING OIL ANY IDEA IS IT JUST A REPLACE THE PART KIND OF JOB.. THANK YOU

your oil sensor comes on at less than ten psi, you may have internal engine damage how many miles on engine, any gum up inside engine, you can try to put on a high pressure high volume melling oil pump to try to help for the time being, but you may need to have it torn and repaired.

oil pressure sending unit is not working right.