Which vehicles are exempt from LPFET?
- Vehicles not originally equipped, and not required by state or federal law to be equipped, with a fuel evaporative control system.
- Dual Gas Tanks - Vehicles with two or more fully operational fuel tanks or gas tanks.
- Vehicles with fuel evaporative lines not accessible without requiring the vehicle to be partially dismantled to gain access.
- Vehicles powered exclusively by compressed natural gas (CNG), liquefied petroleum gas (LPG), or liquid natural gas (LNG).
In Case of Failure: In the unfortunate event that your vehicle fails the LPFET or EVAP test, you will need to seek repairs at a state certified smog check repair center. The entire EVAP system route will need to be traced. The system should consist of fuel vapor hoses running between the gas tank to the charcoal canister, through a purge valve and into the intake manifold. The smog technician will need to ensure that all hoses, solenoids and valves belonging to the EVAP system are connected and functioning properly. In most cases if a thorough diagnosis is conducted, the fault should be simple to find.
The only problem some smog repair stations have reported so far has been difficultly following certain EVAP hoses through the vehicle's chassis and areas not plainly visible. An expert repair station can deal with this issue.