Replacing fuel filter. Fuel injector nozzle or injector pump repair. After repairing or replacing any fuel line. Before putting engine back into service in the spring, if fuel system has been drained. Replacement of electric or mechanical fuel pump.
Any time air is permitted to enter the fuel system.
Be sure there is a sufficient supply of fuel in the fuel tank. Open the fuel shut-off valve at the tank. Model 15 has a mechanical fuel pump. Therefore with decompression on, turn engine over with starter. Slowly loosen the air bleed plug on the fuel filter, letting air escape until an air free flow of fuel is evident.