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How do I fix vapor lock on a car that’s fuel-injected?
My car has been experiencing some rough acceleration and then stalling. It’s hard to get it restarted. I’m assuming vapor lock. How do I fix vapor lock on a car that’s fuel-injected?
Bonnie Stinson · Updated on
Reviewed by Shannon Martin, Licensed Insurance Agent.
So sorry to hear about your car troubles! Vapor lock is usually caused by overheating, so the solution is to lower the temperature of the fuel system**.
Most modern cars are fuel-injected. When compared to carburetors, fuel injection offers serious benefits like improved efficiency and less maintenance. However, the major drawback is that when a fuel-injection system is damaged, maintenance can be very complex.
Start by examining the system. Ensure that the fuel filter is not restricted.
Here are some quick ways to cool down your fuel system:
- Popping the hood to vent the engine
- Parking in a cool area (not on blacktop)
- Pouring cold water over the fuel system
Once the car has cooled down, start the engine. Press down lightly on the gas pedal while cranking to help vent any leftover vapor. Keep the gas pedal steady as the engine sputters to clear all the vapor.
For a long-term solution, try:
- Installing metal heat shields to reflect heat away
- Installing fuel injector wrappers to reflect heat away
- Installing an electric fuel pump near the fuel tank with a vapor discharge valve
Now, this assumes that your fuel system is not damaged but simply overheating. The symptoms you described could also signal a problem with the ignition coil—or another more serious problem.
Either way, it’s wise to take your vehicle to a repair shop. The complex sensors and electric brain (ECU) in a fuel-injected vehicle are best calibrated by a trained professional.
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- Gregory R.
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