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HomeRepair HelpRepairSmall engine leaks gas Repair
Small engine leaks gas
If your small engine is leaking gas, shut off the fuel supply, keep the engine away from sparks or flames, and inspect where the fuel is coming from. The most likely cause is a dried-out or missing carburetor gasket, especially when gas is leaking from the bottom of the carburetor. Next, check the carburetor float bowl gasket and carburetor bowl gasket for cracks, shrinkage, or improper seating. On seasonal equipment, stale or ethanol-blended fuel left in the carburetor is a common root cause of gasket damage and other carburetor problems. If the leak is not at the carburetor, inspect the fuel tank for cracks, then check the fuel line for dry, brittle, or split sections. A cracked fuel tank or fuel line must be replaced, not patched. Finally, inspect the primer bulb, which can become brittle and leak gas as it ages. These common causes apply whether you have a lawn mower, snowblower, pressure washer, or another small engine. Enter your model number to find the exact replacement carburetor gasket, float bowl gasket, fuel tank, fuel line, or primer bulb for your specific engine.
01 - Carburetor Gasket
The carburetor gasket might be dried out or missing. If the leak is coming from the bottom of the carburetor, try replacing the carburetor gasket.
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02 - Float Bowl Gasket
The carburetor float bowl gasket might be dried out or missing. If the leak is coming from the bottom of the carburetor, try replacing the carburetor float bowl gasket.
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03 - Carburetor Bowl Gasket
The carburetor bowl gasket might be dried out or missing. If the leak is coming from the bottom of the carburetor, try replacing the carburetor bowl gasket.
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04 - Fuel Tank
The fuel tank might be cracked or have a small leak. Inspect the fuel tank for leaks. If there is a leak, replace the fuel tank—do not attempt to repair it.
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05 - Fuel Line
One or more of the fuel lines may have a leak. Inspect the fuel lines for cracks. If any of the fuel lines are cracked or dry, replace them. Do not attempt to repair a fuel line—if a fuel line is cracked, you must replace it.
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06 - Primer Bulb
The primer bulb may be leaking. Over time, the rubber of the primer bulb can become brittle and cracked, causing the bulb to leak gas. If the primer bulb is leaking, replace it. Do not attempt to patch or repair the primer bulb.
Highly Likely
07 - Carburetor
Over time, the carburetor may develop cracks due to the vibration and heat of the engine. If the carburetor is cracked, it will leak fuel. Inspect the carburetor for cracks or corrosion. If the main body of the carburetor is leaking, you will most likely need to replace the carburetor.
Common
Frequently Asked Questions
Why is my small engine leaking gas from the carburetor?
What should I check first when my lawn mower or snowblower is leaking gas?
Can a carburetor gasket cause an engine fuel leak?
How do I find the correct replacement part for a small engine fuel leak?
Is it safe to run a small engine that is leaking gas?