1. Fuel Delivery Beyond the Carburetor:
* Fuel Line Integrity: Even if fuel *reaches* the carburetor, ensure the line itself isn't kinked, clogged, or cracked. Replace the fuel line entirely as a preventative measure – they're inexpensive and a common culprit. A tiny blockage can significantly restrict fuel flow, even if it seems to be passing freely.
* Fuel Filter (if present): Some weed eaters have an inline fuel filter. Check if yours does and replace it if it's dirty or clogged. A clogged filter will prevent fuel from reaching the carburetor, even if the line appears clear.
* Fuel Freshness: Old gas can gum up the works. Use fresh, high-quality gasoline mixed with the correct ratio of two-cycle oil specified in your owner's manual.
2. Ignition System:
* Spark Plug: This is the most likely culprit if fuel is reaching the carburetor.
* Remove and Inspect: Take out the spark plug, and examine it closely. Is it:
* Soaked in fuel? This suggests a carburetor problem (flooding) that may require professional attention. Even though you cleaned it, a crucial jet might be blocked.
* Black and sooty? Indicates a rich fuel mixture (too much fuel). Check your fuel mixture ratio.
* White or extremely clean? Could mean a lean fuel mixture (too little fuel) or a lack of combustion.
* Damaged or broken? Replace it.
* Test for Spark: Connect the spark plug wire to the spark plug. Hold the spark plug against the engine block (grounded) and pull the starter cord. You should see a bright blue spark. If not, the ignition system needs attention.
* Ignition Coil: If you have a spark plug, the ignition coil is the next suspect. Testing this usually requires a multimeter and some electrical knowledge or a professional.
* Ignition Switch (if applicable): Ensure the switch is in the "ON" position and functioning correctly. Sometimes, a faulty switch will prevent the engine from receiving power.
3. Air Intake:
* Air Filter: A clogged air filter restricts airflow, leading to poor performance or no start. Remove, clean, or replace the air filter.
4. Other Considerations:
* Starter Cord: A worn or broken starter cord can prevent the engine from spinning fast enough to start.
* Engine Compression: Low compression prevents the engine from building up enough power to start. This requires a compression tester to diagnose.
Troubleshooting Steps:
1. Replace the fuel line. This is the easiest and cheapest first step.
2. Check and/or replace the air filter.
3. Inspect and test the spark plug. This is the most likely cause.
4. Inspect the fuel filter (if applicable).
5. Check fuel freshness. Use fresh fuel mixed correctly.
If you've tried all these and the weed eater still won't start, it's time to consider professional help. A small engine repair shop can diagnose and fix more complex issues like problems with the ignition coil, carburetor (even after cleaning), or low engine compression.
