Craftsman S180 42cc Chainsaw MECH-FUEL-LEAK Error Fix: Fuel Leaking from Chainsaw — Fire Hazard

Error code MECH-FUEL-LEAK on the Craftsman S180 42cc Chainsaw means: Fuel Leaking from Chainsaw — Fire Hazard. Fuel (gasoline/oil mix) is leaking from the chainsaw. This is a serious fire hazard since chainsaws operate near wood and sawdust. Stop the saw immediately and do not restart until the leak is repaired. Common leak locations: (1) Fuel lines — 2-cycle fuel is aggressive to rubber, and chainsaw fuel lines deteriorate faster than on 4-cycle engines. Inspect the fuel line from the tank to the carburetor for cracks, splits, or hardening. Replace with fuel-rated line of the correct diameter. (2) Fuel cap/vent — the fuel cap gasket deteriorates or the cap vent allows fuel to seep out during operation (vibration and angle changes cause fuel to slosh). Replace the cap. (3) Primer bulb — if equipped, the rubber primer bulb can crack and leak fuel. Replace. (4) Carburetor gaskets — the gaskets between the carburetor, intake manifold, and engine can fail, allowing fuel to seep out. Replace the gasket set. (5) Fuel tank — cracks in the plastic fuel tank from dropping or UV exposure. On some models the tank is integrated into the chassis and replacement requires significant disassembly. Fuel-resistant epoxy may work for small cracks.

The most successful fix is "Replace Fuel Lines and Carburetor Gaskets" (hard difficulty, ~90 minutes). Estimated DIY cost: $15-$30. HomeMD has 2 community-ranked fixes for this error.

This error is rated critical severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Yes — the top-ranked community fix ("Replace Fuel Lines and Carburetor Gaskets") is rated hard difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Needle-nose pliers, Fuel line clamp tool, Socket wrench set.

DIY cost: $15-$30. Professional repair typically costs $150-$220. Many homeowners save money by trying the top-ranked community fix first.

The Craftsman S180 42cc Chainsaw has 7 other known error codes, including: MECH-CHAIN-BRAKE (Chain Brake Malfunction — Will Not Engage or Release), MECH-CHAIN-WONT-SPIN (Chain Does Not Rotate When Throttle Is Applied), MECH-DIES-UNDER-LOAD (Engine Dies or Bogs Down When Cutting), MECH-OILER (Chain Oiler Not Working — Bar and Chain Overheating), MECH-PULL-CORD (Starter Rope Breaks or Will Not Retract), and 2 more.

Error code MECH-FUEL-LEAK also appears on 3 other Craftsman models: Craftsman B210 27cc 2-Cycle Gas Leaf Blower (210 MPH), Craftsman M110 140cc 21" Push Gas Lawn Mower, M270 21 in 159 cc 3-in-1 Self-Propelled Gas Push Mower. The fix may vary by model, so check each model's specific page for tailored repair steps.