- The most common cause of gas pouring out of the carb is a stuck or malfunctioning float valve. The float valve is located inside the carburetor and is responsible for regulating the fuel level in the float bowl.
- If the float valve is stuck open, it will allow too much gas to flow into the carburetor, causing it to overflow and pour out of the carb. To fix this, you can try cleaning the float valve with carburetor cleaner or replacing it if it is damaged.
2. Float Bowl Overflow Tube Clogged
- Another possibility if the float valve seems to be working properly is a clogged float bowl overflow tube. This tube allows excess fuel to drain from the float bowl back into the fuel tank.
- If this tube is clogged, it can cause the fuel to overflow from the float bowl and pour out of the carb. To fix this, you can try cleaning the overflow tube with carburetor cleaner or compressed air.
3. Damaged Fuel Line.
- If the float valve and overflow tube are working properly, the problem could be a damaged fuel line.
- A cracked or loose fuel line can allow gas to leak out and pour onto the carb, causing it to flood and overflow.
- To fix this, you will need to replace the damaged fuel line.
4. Faulty Vacuum/Fuel Pump
- On some models, a vacuum or fuel pump can be the culprit if gas is pouring out of the carb. These pumps are responsible for pulling or pushing fuel into the carburetor but may malfunction and flood the carb with too much fuel.
- Inspect the vacuum or fuel pump for any damage and replace it if needed.
5. Faulty Vent Valve
- Some 250 ES Big Reds have a vent valve on the fuel tank. This valve prevents the fuel tank from building up pressure and causing fuel to overflow.
- If the vent valve is faulty or clogged, it can cause excessive pressure in the fuel tank, leading to fuel leaking from the carburetor. Clean or replace the vent valve to remedy the issue.
6. Carburetor Problems.
- If none of the above solutions resolve the issue, the carburetor itself may be the culprit. Other problems within the carburetor, such as a dirty or clogged main jet, misadjusted float height, or worn-out components, can cause fuel to overflow. In such cases, it's best to have the carburetor professionally cleaned or overhauled to restore its proper function.
