The Ultimate Guide to Evap System Leak Diagnosis

An EVAP leak is a fault in the evaporative emission control system (EVAP). The EVAP's function is to keep gasoline fumes in the fuel tank ... A strong smell of gasoline around the vehicle can be an indication of an EVAP system failure. An EVAP system failure can cause decreased fuel ... I would normally say that an evaporative leak is not a problem as I deal with that all the time. Very few of them are loose or defective gas caps. The P0455 code is for a gross evap leak. It's usually triggered by a leaky fuel cap. Try squirting a shot of WD-40 in the cap vent and rubbing a dab of grease ... Any ideas where to go from here if the message or code returns? Oh, I have also replaced the canister vent solenoid, purge valve and oem fuel ... Could be a small hole in one of the evap system lines, could be a faulty purge solenoid, or a loose gas cap. 2005 Ford Taurus 3.0 Vulcan engine. Auto Climate. New Evap purge valve under hood and vent solenoid on the canister, new Egr and tube (Old one broke, go figure) The code typically happens when the gas tank reaches about half empty after gas fill up. Changed recently the purge valve and treated the gas cap with WD40 ... The EVAP canister purge valve, which is fitted in the line from the EVAP canister to the plenum, is controlled by the ECM which determines the ... P0456 stands for “Evaporative Emission System (EVAP) Small Leak Detected.” Your car's computer will set this code when it determines that there's a minor leak.