Unlock the Right Part
for Your Repair
Find the exact part you need
Enter your model number to see parts that fit your machine.
Price Match Guarantee
In-stock parts ship the same day
365-Day Return Policy
Price Match GuaranteeChoose Product
Identify Problem
03
Find Solutions
HomeRepair HelpCub Cadet RepairCub Cadet Lawn mower leaking gas Repair
Cub Cadet Lawn mower leaking gas
If your Cub Cadet lawn mower is leaking gas, start at the carburetor. The most common cause is a worn, dried out, or missing carburetor bowl gasket, especially when gas leaking from the bottom of the lawn mower seems to trace back to the carburetor bowl. Next, check the float needle, since a damaged needle can fail to shut off fuel flow and cause the carburetor to overflow. A bad carburetor gasket is another likely source of a lawn mower gas leak, followed by a cracked primer bulb that seeps fuel when pressed. If the leak is not coming from those parts, inspect the fuel shut-off solenoid, the valve, and connected fuel lines for cracks or loose fits. A stuck carburetor float can also cause a mower leaking fuel problem by letting too much gas into the float bowl. Cleaning the carburetor may free up the float, but if not, you may need a carburetor rebuild or full replacement. Enter your Cub Cadet model number on RepairClinic.com to find the exact carburetor bowl gasket, float needle, primer bulb, carburetor gasket, fuel shut-off solenoid, or other replacement part for your mower.
01 - Cub Cadet Carburetor Bowl Gasket
If the lawn mower leaks gas the carburetor bowl gasket on the bottom of the carburetor might be dried out or missing. If the leak is coming from the bottom of the carburetor, try replacing the carburetor bowl gasket.
Enter model number to search for the required part specific to your product
Top Solution
02 - Cub Cadet Float 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.
Top Solution
03 - Cub Cadet Carburetor Gasket
If fuel is leaking from the bottom of the carburetor, the carburetor gasket might be dried out or missing.
Top Solution
04 - Cub Cadet Primer Bulb
Over time, the rubber of the primer bulb can become brittle and cracked. If the primer bulb is leaking, replace it. Don't try to patch or repair it.
Top Solution
05 - Cub Cadet Fuel 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.
Highly Likely
06 - Cub Cadet Float
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.
Highly Likely
Frequently Asked Questions
Why is my Cub Cadet lawn mower leaking gas from the bottom of the carburetor?
How do I fix a Cub Cadet carburetor leaking gas?
Can a bad primer bulb cause a lawn mower gas leak?
What should I check if my Cub Cadet mower is leaking around the fuel shut-off solenoid or fuel line?
How do I find the right Cub Cadet gas leak part for my mower?
Shop by Cub Cadet appliance Parts
Shop by Popular Cub Cadet Models
Our Story
Family-owned and operated since 1912, Burke America Parts Group is the longest-running genuine appliance, HVAC, and outdoor power equipment parts solution in North America. At Repair Clinic, we're proud to be an international brand trusted by the pros as well as the DIY community.
About Repair Clinic
© 2026 RepairClinic.com