Tools Used For EVAP Leaks And Common Problems
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Here is a list of tools I use every day at the shop. Let me know if you use them too in the comments!
The Evaporative Emission System (EVAP) can be a headache to repair without the correct tools. This article will give you a list of the tools used to find EVAP problems, including leaks.
For an overview of the Evaporative Emission System (EVAP), check out this article.
Smoke Machine
The automotive smoke machine is used to find leaks in the EVAP system.
As smoke fills the EVAP system, any smoke that escapes reveals the leak.
In some cases, a small leak can take a long time to find, even with smoke. Always check o-ring locations, like around the ends of fuel vapor lines and the gas cap.
The smoke machine I use is available on Amazon. Check it out here.
Scan Tool
The automotive scan tool is used to read and clear fault codes, review live data, and control different components on the EVAP system.
In most cases, manually controlling EVAP components is a necessity for locating a problem.
EVAP components can be tested with the scan tool’s bi-directional controls.
These tests can determine if a component has failed or if the correct voltage is being applied.
Service Information
Information about the EVAP system is key to diagnosing problems. System designs and component names change from each automotive manufacturer.
Having a quality source of information, like Alldata or Identifix, can save you time and money.
The diagnostic process for EVAP problems
Here is a quick process to help you diagnose an EVAP problem.
Read fault codes
Familiarize yourself with the fault code and EVAP system with service information
Connect the smoke machine if it is a leak or test a component with bi-directional controls with the scan tool
Locate the leak or component failure
Make the repair
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