evap leak in fuel line
 

i keep getting this code. took the car to dealership they said the grommet between fuel tank and filler valve should be replaced. replaced the grommet and also got a new gas cap from the dealership. check engine light is still coming on but my mechanic can't detect any leaks.

What is the trouble code?

Did you disconnect the battery after you replaced those parts?

the two codes it spits out are P0457 and P0455. not sure about the battery. i mean to say my mechanic replaced the grommet and reset the error codes/lights.

Tech notes:
The P0455 it’s a very common code, because the code is set if the gas cap is loose or missing. Start by tighten the gas cap and clearing the code. In most cases the code can be clear by disconnecting the car battery for about 30 minutes.

P0455 FORD Description:
Vehicles that meet enhanced evaporative requirements utilize a vacuum-based evaporative system integrity check. The evap system integrity check uses a Fuel Tank Pressure Transducer (FTPT), a Canister Vent Solenoid (CVS) and Fuel Level Input (FLI) along with the Vapor Management Valve (VMV) or Electric Vapor Management Valve (EVMV) to find 0.040” diameter or larger evap system leaks. Federal vehicles can utilize a 0.040" leak check rather than the 0.020" leak check required for California vehicles.
Evaporative Emission Control System Leak Detected Gross Leak





P0457 FORD Description:
This diagnosis detects leaks in the Evaporative Emission System (EVAP) purge line using engine intake manifold vacuum. If pressure does not increase, the Engine Control Module (ECM) will check for leaks in the line between the fuel tank and EVAP canister purge volume control solenoid valve under the following vacuum test condition.


The vacuum cut valve bypass valve is opened to clear the line between the fuel tank and the EVAP canister purge volume control solenoid valve. The EVAP canister vent control valve will then be closed to shut the EVAP purge line off. The EVAP canister purge volume control solenoid valve is opened to depressurize the EVAP purge line using intake manifold vacuum. After this depressurization is implemented, the EVAP canister purge volume control solenoid valve will be closed.

yeah i've had the codes reset a few times. got a new gascap from Ford and it is the kind that just clicks once. i'm sure it's on correctly so i guess i'll be scheduling some service with Ford :|