Abstract: A carburetor having a fuel pump connected to a fuel supply, a fuel inlet valve, a diaphragm-controlled fuel chamber, and a diaphragm to control said fuel inlet valve in response to sub-atmospheric engine pulses, with a manually operable resilient pressure dome to create a sub-atmospheric pressure in the fuel chamber to move said diaphragm to an inlet valve open position and pull fuel into said chamber from a fuel supply to prime said carburetor for cold starts or restarts after fuel depletion.
Abstract: A fuel feed system having a fuel tank and a pump for pumping up fuel from said fuel tank and for feeding the same to a combustor, characterized in that there is provided between said fuel tank and said pump, a negative pressure actuating valve which is closed against fuel pressure in said fuel tank but opened by a negative pressure created by said pump.