What is a leak detection pump replacement?

The leak detection pump checks your engine for fuel vapor leaks. If it senses a leak, the pump will trigger your “Check Engine” light. The leak detection pump is essential to making sure your car’s evaporative emission system (EVAP) is working properly.
The EVAP makes sure that all gas vapors produced by your vehicle are contained inside the fuel system. This prevents smog and keeps the number of vapors coming out of your tailpipe within acceptable limits. With the help of the leak detection pump, the EVAP keeps your engine running at top efficiency while producing the smallest amount of air pollution.
A mechanic will assess your leak detection pump to confirm whether or not it needs a replacement.

How to replace a leak detection pump

The mechanic will usually follow these steps to replace your leak detection pump:
  • Disconnect the negative cable from the battery
  • Confirm the location of the leak detection pump
  • Remove the pump’s vapor/vacuum lines and power connection
  • Install the new leak detection pump
  • Re-affix the pump’s vapor/vacuum lines and power connection
  • Reconnect the negative cable to the battery
  • Test the battery and ensure that the leak detection pump is functioning correctly
Key Takeaway: Replacing the leak detection pump is a difficult procedure that should only be done by trained professionals.

When does my car need a leak detection pump replacement?

If there is something wrong with your leak detection pump, the “Check Engine” light may turn on. A mechanic will be able to tell from the diagnostic trouble code if the leak detection pump is malfunctioning.
As this replacement procedure is complex, it’s best to leave it to the trained professionals.

How important is a leak detection pump replacement?

The leak detection pump checks your engine for fuel vapor leaks. Vapor leaks are bad for your vehicle and the environment and are regulated by federal law.
Without a functioning leak detection fuel pump, your vehicle also runs the risk of reduced engine efficiency.

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