top of page

EVAP Emission System

What is EVAP Emission System?

  The evaporative (EVAP) control system prevents fuel tank vapors entering the atmosphere. Fuel evaporation emits hydrocarbons (HC) directly into the atmosphere. As fuel evaporates in the tank, vapors are routed into a charcoal canister. Trough the use of a purge solenoid, manifold vacuum draws these vapors into the combustion chamber. The EVAP system, to work most effectively, should be completely sealed, including the fuel cap, tubes, valves, canister, and fuel tank.


Possible Problems with EVAP System

    Common problems with the EVAP system include faults with the purge solenoid that vents fuel vapors back to intake manifold, leaks in vent or vacuum hoses, and loose or missing gas caps. The most common fault code is P0456, which indicates a small leak (often a loose gas cap).

Inspection of EVAP System for Leaks

   Smoke testing is the best way to test the EVAP system. The idea behind the smoke test is simple, blow smoke into the EVAP system and look for smoke escaping from a compromised valve, seal, tube, or hose.

Our mobile mechanic will come to your house or office to do a check engine light diagnostic and perform Smog Test test by using our state of the art Emission Smog Detector Machine.


bottom of page