- High operating temperatures: When a lawn tractor is used continuously or in high ambient temperatures, the engine bay becomes hot, causing fuel in the fuel line to vaporize. This is especially true for older craftsman tractors without temperature-controlled fuel systems.
- Fuel line routing: If the fuel line is routed too close to the engine or other heat sources, it can cause the fuel to heat up and vaporize.
- Kinked or damaged fuel line: A kink or damage in the fuel line can restrict the fuel flow and create a pressure drop, leading to vapor lock.
To fix Vapor Lock in craftsman lawn tractors:
1. Cool Down: Turn off the engine and allow it to cool down for at least 30 minutes.
2. Inspect Fuel Line: Check for any kinks or bends in the fuel line that may restrict the fuel flow.
3. Fuel line placement: Ensure that the fuel line is not too close to any heat sources, such as the engine block.
4. Check Ventilation: Make sure that the fuel tank is properly ventilated to allow hot air to escape from the engine bay.
5. Try different gasoline: Some gasolines are more volatile than others. Use fuel with a lower Reid Vapor Pressure (RVP) to reduce vapor lock.
6. Install a vapor lock fuel regulator: This is a device installed in the fuel line to help regulate fuel pressure and prevent the fuel from turning into vapor.
7. Use ethanol-blended fuel: Ethanol can help to prevent fuel evaporation.
8. Keep the fuel tank full: This helps to reduce the amount of air that can enter the fuel line, which can lead to vapor lock.
If vapor lock persists after following these steps, you may need to have the tractor checked by a qualified small engine mechanic.
