If the fuel is fresh, check the fuel lines for cracks. Add fuel stabilizer to the gas when you refill the tank to help keep the fuel fresh. First, make sure there's fresh gas in the tank old gas collects water and burns poorly. The engine needs gas, compression and spark in order to start. What to do when your Echo hedge trimmer engine won't start Replace the spark plug if it's fouled or damaged. The engine spark plug ignites the fuel mixture in the cylinder to drive the piston. Replace the gearbox if hedge trimmer blades don't move back and forth. The gearbox controls the reciprocating movement of your Echo hedge trimmer cutting blades. Replace the carburetor if it's clogged or damaged. The carburetor mixes the air and fuel that enter the engine cylinder and ignite to drive the piston.
