Your vehicle’s fuel system is sealed to trap vapors before releasing into the atmosphere. The EVAP system (evaporative emissions control system) draws in fresh air, gathers up vaporized hydrocarbons, and delivers to the intake system to be burned in the engine.
If there is a leak or blockage in the EVAP system, a trouble code generates, activating the check engine light. There are many EVAP system components, which can have problems as simple as a worn or loose gas cap or rusty pipe.
Other EVAP system components include the fuel tank, purge valve, canister vent valve, charcoal canister, the canister filter, the fuel tank pressure sensor, the fuel level sensor, electronic control module, vapor lines, and the vapor switching valve. Therefore, skill and specialized equipment is essential to properly diagnose an EVAP system problem.
We can take a reading and perform function tests on the various valves. If necessary, a low-pressure smoke test can be performed to visually spot leaks. Proper testing equipment is required to not cause further damage.
EVAP system problems usually do not affect performance or cause damage. However, there is one check engine light among hundreds of problems that can trigger it. When you do not fix an EVAP problem, the check engine light can remain on, masking other problems that might occur.
The EVAP system can release harmful emissions into the atmosphere. If local regulations require passing an emissions test, your vehicle may fail. If you have an illuminated check engine light, come have your vehicle diagnosed for your peace of mind.