What to do when you see your Lowrance gas line trimmer leaking gas
Move the line trimmer to a well-ventilated area and check the fuel lines for cracks. Replace the fuel lines if they're leaking. If fuel leaks from the carburetor, rebuild or replace the carburetor to prevent gas from leaking.
Check the fuel tank cap and its seal. Replace the fuel tank cap if its seal is damaged and leaking.
Check the fuel tank and replace the tank if it's damaged.
What to do when your Lowrance gas line trimmer won't start
The engine needs gas, compression and spark in order to start. First, make sure there's fresh gas in the tank-old gas accumulates water and burns poorly. Replace the fuel if it's old. Add fuel stabilizer to the gas when you refill the tank to help keep the fuel fresh.
If the fuel is fresh, check the fuel lines for cracks. Air enters the carburetor instead of fuel when the fuel lines have cracks. Replace the fuel lines if you find cracks in the lines. If the fuel lines are okay, you may need to rebuild or replace the carburetor because a dirty carburetor won't supply the engine with fuel.
Next, disconnect the spark plug wire and remove the spark plug. If you see deposits or corrosion on the electrodes, replace the spark plug.
Finally, to check for compression, remove the spark plug, press your thumb over the opening and pull the starter cord. If you don't feel air pushing from the cylinder, it's likely that the piston rings need to be replaced (for an accurate compression reading, use a compression gauge).