Answer :
Final answer:
When there is an EVAP leak in a vehicle, the check engine light will illuminate, and the car may experience decreased fuel efficiency due to escaped fuel vapors.
Explanation:
If there is an EVAP leak in a vehicle newer than 1996, two primary things will happen. First, the check engine light (CEL) will likely illuminate on the dashboard. This is because modern vehicles are equipped with an Onboard Diagnostics II system (OBD-II), which monitors the evaporative emission control system (EVAP) for leaks and other faults. When the system detects a leak, it triggers the CEL to alert the driver.
Second, there could be a potential decrease in fuel efficiency. The EVAP system is designed to capture fuel vapors from the fuel tank and reintroduce them into the combustion process. If there's a leak, these vapors can escape, which means the vehicle may use more fuel to compensate for the lost vapors that were not burnt during combustion.
