13. FUEL SYSTEM/CARBURETOR/ FUEL PUMP/ FUEL TANK DINK 50/125 FUEL PUMP CONSTRUCTION The fuel pump adopted for this model is a vacuum-type 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(DINK 125) Lower Cover Outlet Big Spring Vacuum Duct Spring Body Washer Comp Valve Spring Inlet Upper Cover FUEL PUMP CONSTRUCTION(DINK 50) Vacuum Tube Outlet Inlet Screws 13-5