Fig. 46 - Removing and Inserting Spiral

TM 5-4240-501-148P CARBURETION Pulsa-Jet Fig. 46 - Removing and Inserting Spiral Fuel Pipe Check balls are not used in these fuel pipes. The screen housing or pipe must be replaced if the screen can not be satisfactorily cleaned. The long pipe supplies fuel from the tank to the pump. The short pipe supplies fuel from the tank cup to the carburetor. Fig. 47. Fuel pipes are nylon or brass. Nylon pipes are removed and replaced by using a 6 point socket, or open end wrench. Fig. 48. WHERE BRASS PIPES ARE USED, THE SCREEN HOUSING ONLY IS REPLACED. Fig. 49. Clamp the fuel pipe in a vise (do not overtighten). Drive off the brass housing with a screw driver. The new housing is installed by tapping it on the pipe with a soft hammer, Fig. 49. Fig. 47 - Fuel Pipes Fig. 48 - Replacing Fuel Pipe Fig. 49 - Replacing Screen Housing Assembly Needle Valve and Seat Remove needle valve to inspect. If carburetor is gummy or dirty, remove seat to allow better cleaning of metering holes. Fig. 50. Do not resize metering holes. Fig. 50 - Metering Holes Pump Disassembly and Repair Remove fuel pump cover, diaphragm, spring and cup. Fig. 51. Inspect diaphragm for punctures, cracks and fatigue. Replace if damaged. Current style supersedes the previous style. When installing the pump cover, tighten the screws evenly in staggered sequence to insure a good seal Inspect all sealing surfaces for nicks or damaged and repair or replace as required. Fig. 51 - Pulsa-Jet Carburetor 15