Your car's fuel system is responsible for providing the engine with the right amount of gasoline. The key component in this system is the fuel pump, which is responsible for moving gasoline from the gas tank to the engine.
The pressure that the fuel pump produces is measured in pounds per square inch (psi). While there are different types of fuel pumps and each one has its own range of acceptable pressures, most modern vehicles have a fuel pump that produces between 30 and 60 psi.
If your vehicle's fuel pressure is outside of this range, it can cause problems with starting the engine or maintaining a consistent idle speed. If you think your car's fuel pressure might be off, you can have it checked by a professional mechanic.