How Does a Vacuum Fuel Pump Work: An In-Depth Look
A vacuum fuel pump uses the vacuum pressure created by the engine’s intake manifold to draw fuel from the gas tank and then delivers it to the carburetor or fuel injection system. As the piston moves down, an intake valve opens and creates a suction that pulls the fuel from the tank and through a filter. The fuel then travels through a diaphragm pump that is moved by the vacuum pressure. This pump increases the pressure of the fuel and delivers it to the carburetor. As the piston moves up, an exhaust valve opens and the process is repeated.