- After a carburetor installation, there might be vacuum leaks. Leaking vacuum can lean out the fuel/air mixture, causing your car to stall when you abruptly press the brakes. Vacuum lines connect the carburetor to the components it needs to function correctly, such as the brake booster and power brake unit (if equipped). Make sure all vacuum lines are properly connected and that there are no cracks or breaks in the hoses.
2. Fuel Filter:
- A clogged or partially obstructed fuel filter can restrict fuel flow to the carburetor, especially during sudden fuel demands, such as those caused by braking. This can result in a lean fuel condition and lead to stalling. Inspect and replace the fuel filter if necessary.
3. Fuel Supply:
- Verify that the fuel supply system is working correctly. Check the fuel pressure, as a low fuel pressure can cause the car to stall. Also, ensure that the fuel supply line and any installed fuel filter are clear and free of obstructions.
4. Idle Speed Adjustment:
- Proper idle speed is essential for the smooth operation of the carburetor. If the idle speed is set too low, it may cause the engine to stall when additional load is placed on the engine, such as when you press the brakes or turn on the headlights. Adjust the idle speed according to the specifications provided by the vehicle manufacturer or refer to the carburetor manufacturer's instructions.
5. Carburetor Float Level:
- Incorrect carburetor float level can affect fuel delivery and stability. A high float level can cause flooding, while a low float level may not provide enough fuel, resulting in stalling. Check the fuel level in the carburetor's float bowl according to the manufacturer's specifications and adjust if needed.
6. Choke Setting:
- Ensure the choke is functioning correctly. If it stays closed for an extended period when the engine is warm or partially closed when it should be fully open, this can cause a lean condition and stalling. Adjust the choke settings or verify its proper operation.
7. Electrical Issues:
- Problems with the ignition system or electrical components can also lead to stalling. Check for loose or damaged spark plug wires, faulty ignition coils, or other electrical issues that may affect the engine's performance.
If you've checked these potential issues and the problem persists, it's recommended to consult with a professional mechanic or carburetor specialist to accurately troubleshoot the exact cause of the stalling issue and ensure the carburetor is properly adjusted and compatible with your vehicle's setup.
