13. FUEL SYSTEM/CARBURETOR/ FUEL PUMP/ FUEL TANK PEOPLE/PEOPLE S 250 FUEL PUMP CONSTRUCTION: The fuel pump adopted for this model is a fuel pump which utilizes the positive and negative pulsating pressures produced by the engine crankcase to control the oil pump diaphragms and deliver fuel from the fuel tank to the carburetor through the suction valve and outlet valve. FUEL PUMP CONSTRUCTION Lower Cover Outlet Valve Big Spring Vacuum-type Spring Body Washer Comp Valve Spring Inlet Upper Cover 13-4