TM 5-4240-501-148PCARBURETIONPulsa-JetFig. 46 - Removing and Inserting SpiralFuel PipeCheck balls are not used in these fuel pipes. The screenhousing or pipe must be replaced if the screen can notbe satisfactorily cleaned. The long pipe supplies fuelfrom the tank to the pump. The short pipe supplies fuelfrom the tank cup to the carburetor. Fig. 47. Fuel pipesare nylon or brass. Nylon pipes are removed andreplaced by using a 6 point socket, or open end wrench.Fig. 48. WHERE BRASS PIPES ARE USED, THESCREEN HOUSING ONLY IS REPLACED. Fig. 49.Clamp the fuel pipe in a vise (do not overtighten). Driveoff the brass housing with a screw driver. The newhousing is installed by tapping it on the pipe with a softhammer, Fig. 49.Fig. 47 - Fuel PipesFig. 48 - Replacing Fuel PipeFig. 49 - Replacing Screen Housing AssemblyNeedle Valve and SeatRemove needle valve to inspect. If carburetor is gummyor dirty, remove seat to allow better cleaning of meteringholes. Fig. 50. Do not resize metering holes.Fig. 50 - Metering HolesPump Disassembly and RepairRemove fuel pump cover, diaphragm, spring and cup.Fig. 51. Inspect diaphragm for punctures, cracks andfatigue. Replace if damaged. Current style supersedesthe previous style. When installing the pump cover,tighten the screws evenly in staggered sequence toinsure a good seal Inspect all sealing surfaces for nicksor damaged and repair or replace as required.Fig. 51 - Pulsa-Jet Carburetor15
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