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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
first and foremost the fuel leak you identified at or around the pressure regulator is a red flag. driving a vehicle with a fuel leak is extremely dangerous. once the fuel leak is fixed a simple tune up while alleviate most all fuel drains
Please do the following:
- Check and adjust the valve clearance.
- Check the valve timing. Timing belt may have jumped a tooth or it may have wrongly be installed.
- Adjust the ignition timing with strobe light to 8 degrees before top dead center with the map sensor pipe be removed (if it is a distributor type ignition system).
Need more input here iam afraid ,like make and model and where the leak is if the fuel is mixing with oil do not drive it could hydraulic or even worse run away with itself and just run till it blows up ,once it goes turning the key off will not stop the engine it will run on the sump oil mix and watch a con rod come through the block
Checked brakes for possible wheel(s) dragging, as well as tire pressures up to max recommended pressure, and observe if tire wear unusual, signifying improper alignment? Any difference in engine oil grade used?