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John Deere Replacement Part Lawn Mower Leaking Gas

The lawn mowersmall engine often has a separate model number. Use the small engine model number for a complete list of symptoms and parts. Watch our model # lookup video for help finding the model number.

L108/42in Deck/Engine: 31P677-0242-B1

The part(s) or condition(s) listed below for the symptom Lawn mower leaking gas are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.

Cause 1Float Needle

The float needle might not be shutting off the fuel. The float needle opens and closes the float valve to allow fuel to enter the float bowl. If the float needle is damaged, the carburetor will continue to fill with fuel until it overflows. If the float needle is defective, replace it.

Parts
Float Needle for your John Deere Replacement PartLawn Mower
Float Needle - Part # 1611139 Mfg Part # 696136

Valve-float needle

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Cause 2Fuel Shut-Off Solenoid

Check the fuel shut-off valve for leaks, and ensure that the fuel lines fit tightly on the valve. If the fuel shut-off solenoid is leaking, replace it. In addition, inspect the fuel shut off lines for cracks or tiny holes. If a fuel shut-off line is leaking, replace it.

Parts
Fuel Shut-Off Solenoid for your John Deere Replacement PartLawn Mower
Fuel Shut-Off Solenoid - Part # 1611182 Mfg Part # 699915

Solenoid-fuel shut-off

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Cause 3Float

The float might be stuck open. If the float is stuck open, remove the carburetor assembly from the engine and clean it thoroughly. If the cleaning the carburetor is not effective, either rebuild or replace the carburetor.

Parts
Float for your John Deere Replacement PartLawn Mower
Float - Part # 1611119 Mfg Part # 694914
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Cause 4Carburetor Repair Kit

If the engine carburetor leaks gas, rebuild the carburetor with this carburetor kit. Carburetor leaks can be caused by bad gaskets, an sticking float and other defects.

Parts
Carburetor Repair Kit for your John Deere Replacement PartLawn Mower
Carburetor Repair Kit - Part # 1611252 Mfg Part # 796184
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Cause 5Float Bowl Gasket

If fuel is leaking from the bottom of the carburetor, the float bowl gasket might be dried out or missing.

Parts
Float Bowl Gasket for your John Deere Replacement PartLawn Mower
Float Bowl Gasket - Part # 1611172 Mfg Part # 698781
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Cause 6Fuel Filter

Check the connections to the fuel filter and to the filter housing. If any of the fuel lines are dry or cracked, replace them. Don't try to cut off a piece of the fuel line and then reattach it.

Parts
Fuel Filter for your John Deere Replacement PartLawn Mower
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Cause 7Fuel Filter

Check the connections to the fuel filter and to the filter housing. If any of the fuel lines are dry or cracked, replace them. Don't try to cut off a piece of the fuel line and then reattach it.

Parts
Fuel Filter for your John Deere Replacement PartLawn Mower
Fuel Filter - Part # 1567939 Mfg Part # 691035

Briggs and Startton in-line fuel filter with 40 micron rating and 1/4" inlet & outlet. If the engine does not start then the fuel filter may be clogged and not allowing enough fuel to enter the carburetor.

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Cause 8Fuel Filter

Check the connections to the fuel filter and to the filter housing. If any of the fuel lines are dry or cracked, replace them. Don't try to cut off a piece of the fuel line and then reattach it.

Parts
Fuel Filter for your John Deere Replacement PartLawn Mower
Cause 9Fuel Line

If any of the fuel lines are dry or cracked, replace them. Don't try to cut off a piece of the fuel line and then reattach it.

Parts
Fuel Line for your John Deere Replacement PartLawn Mower
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Cause 10Fuel Pump

Ensure that the fuel lines and vacuum line fit tightly on the fuel pump. Inspect the fuel pump body for cracks or tiny holes. If the fuel pump has a leak, replace it.

Parts
Fuel Pump for your John Deere Replacement PartLawn Mower
Fuel Pump - Part # 1568007 Mfg Part # 808656

Fuel pump. If this fuel pump is being installed on a Intek V-Twin engine originally equipped with a metal fuel pump, related item 1567967. The fuel pump supplies fuel to the carburetor while the engine is running. If the fuel pump is clogged, the engine may not start or may run rough.

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