DIY Chain Saw Repair for a Gas Leak

Place the chain saw on top of the work bench.

Twist off the gas cap, flip over the cap and inspect the gasket on the inside. If the gasket has become cracked or split, pry it off with a small slotted screwdriver and press in a new gasket.

Inspect the fuel line grommet (the grommet is pressed into the gas tank and has the fuel line inserted into it). If it has begun to crack or leak, pry out the old grommet with the slotted screwdriver and slide out the fuel line. Press in a new grommet.

Inspect the fuel line; if it has become cracked or developed holes, replace the fuel line by sliding off the the fuel line from the carburetor and from the grommet. Slide the new fuel line into the carburetor and into the grommet.

Press down on the primer bulb on the side of the carburetor, and hold it. Inspect the bulb for cracks and leaks; if you detect any leaks, replace the primer bulb. Remove the four screws holding the primer bulb in place using a Phillips screwdriver. Slide out the old primer bulb, and slide in a new one. Reinstall the four screws.

Check the gasket between the engine block and the carburetor; if you detect leak, replace the broken gasket. Twist off the air filter cover on top of the carburetor, and remove the air filter to expose the two screws that hold the carburetor in place. Remove the screws using the Phillips screwdriver, then remove and replace the gasket. Reinstall the carburetor.

Check over the carburetor for leaks; if all previous steps did not locate the leak, the carburetor is your last checkpoint. If you detect leaks, replace the carburetor. Twist off the air filter cover and air filter. Remove the two Phillips screws from the carburetor, turn the carburetor sideways and twist off the throttle linkage. Install the new carburetor, twist on the throttle linkage and tighten the screws back into the carburetor.