No sir. The tank nozzle auto stop is independent of tank pressure. There is a small hole next to the main fuel nozzle. When the petrol level rises to the point where this small hole is blocked by petrol, the fuel nozzle trips and stops sending any more petrol to the tank. Here is a more detailed explanation:
The functioning of this effect goes like this in an auto-off fuel pump. There is a very small hole near the tip of the nozzle. And, this hole is connected to the handle by a small pipe.
The Venturi Effect is used to create suction in this pipe. When the vehicle’s fuel tank is empty, the vacuum pulls air through the hole, and the air moves easily.
When the fuel level in the tank rises enough to block the tiny hole, a mechanical system in the handle of the pump senses the change in suction and turns off the nozzle immediately.
If you look at the nozzle the next time you go to the filling station to fill up your car, you’ll see a small hole. This tube goes back up into the handle of the fuel pump. When fuel flows through the nozzle, the Venturi effect creates a vacuum that pulls air up through the tube.
As long as the tank isn’t full, air can flow up into the handle freely, and nothing else tends to happen except that fuel keeps pouring into your car.
So the only thing that can vary the actual level in the tank is the length of the nozzle was different at different fuel stations.