Final answer:
The fuel pressure in a pressure-injection carburetor is maintained by a fuel pump and pressure regulator.
Step-by-step explanation:
In a pressure-injection carburetor, the fuel pressure is maintained by a fuel pump. The fuel pump pushes fuel from the fuel tank to the carburetor, creating and maintaining pressure. The fuel pressure is necessary for the proper functioning of the carburetor, as it ensures that the fuel is delivered to the engine at the correct rate and pressure.
A pressure regulator is often used in the fuel system of a pressure-injection carburetor to control and maintain the fuel pressure at a certain level. The pressure regulator limits the maximum fuel pressure, preventing it from exceeding the desired level. This helps to ensure that the fuel is not delivered to the engine at excessively high pressure, which could cause damage to the engine or affect its performance.
The fuel pump and pressure regulator work together to maintain the fuel pressure in a pressure-injection carburetor, ensuring proper fuel delivery to the engine.