How to Troubleshoot a Clogged Carburetor?
1 Answers
Troubleshooting methods for a clogged carburetor: 1. Main fuel jet, emulsion tube, and main nozzle clogging: The air bleed holes (foam holes) around the main nozzle are blocked (or partially blocked) by dirt, preventing air from entering the main nozzle to form an emulsion mixture, resulting in poor fuel atomization. When the engine is under no load, pressing the throttle makes it difficult to increase the RPM, and the carburetor backfires. While driving, you may experience insufficient power, the engine stalling easily at idle, and difficulty starting. During inspection, if rapidly pressing the accelerator pedal and using the accelerator pump to add fuel to the venturi makes the engine run normally and eliminates stalling, the issue is a clogged main fuel supply system. Disassemble, clean, and unclog it, replacing parts if necessary. 2. Accelerator fuel-air passage clogging: During inspection, rapidly open and close the throttle while observing the accelerator pump nozzle from the carburetor inlet to check if fuel is being sprayed. If no fuel is sprayed, the issue lies with the accelerator pump or a clogged accelerator jet. First, remove the carburetor cover, fill the float chamber with gasoline, and rapidly open and close the throttle to make the accelerator pump piston move back and forth. If the piston encounters significant resistance when moving downward, the accelerator nozzle or fuel passage is clogged. In this case, disassemble, clean the outlet valve, valve seat, and their vent holes, and use compressed air to blow them clear.
