- The most common problems that prevent a Homelite weed eater from running lie in the fuel system. The carburetor needs a continuous supply of fuel to pump the piston and if this is restricted, even a little, the engine will shut off. Start at the fuel tank, clean it and replace the fuel filter.
- Follow the fuel line up to the carburetor and replace the hose if it's cracked or dirty. Many gas problems are caused by a broken gas line. If the trimmer still won't start, remove, disassemble and clean the carburetor. After about three years, the carburetor may need servicing. This time will come sooner if bad gas is used. Extend the life of the carburetor by installing a carb kit, which helps fuel flow to the cylinder.
- The ignition system fires the spark, which needs to happen at the proper moment during the fuel cycle for the engine to work. If the spark is absent or timed improperly, the engine won't start. The simplest solution is to replace the spark plug. But, if this doesn't solve the problem, the ignition module, which sends the electronic pulse up the wire to the spark plug, might need to be replaced. If you suspect this isn't the case, check the air gap between the magnets on the flywheel and ignition module. If this gap isn't precise, the spark will fire at the wrong time.
- Compression problems occur when air leaks from the cylinder, as the piston requires a certain amount of pressure to suction the fuel into the chamber. The worst compression problems may require replacing the gaskets and seals around the piston and crankcase, which may cost more than a new trimmer. Test your engine's compression by attaching a compression gauge to the empty spark plug. Pulling the starter rope should produce a reading over 90 psi. Compression problems are easy to spot, as you will have difficulty pulling the starter rope out or it will be too easy.
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