EVAP stands for Evaporative Emission Control and EVAP system is responsible for succumbing the fuel vapors and then emitting it into the intake manifold once the car engine is running so as to mix with the arriving air fuel mixture. The various parts of the EVAP system are the EVAP canister, the vent solenoid, the filter tube, the dust separator and the canister purge valve, with the canister together with related components situated within the vehicle above the spare tire while the purge valve is situated in the engine compartment adjacent to the brake fluid reservoir. Other accessories include Fuel Tank Pressure (FTP) sensor, Fuel Limit Vent Valve (FLW) assembly, check valve for fuel filler pipe, cap for filler neck as well as the EVAP system check. Overfilling and vapor escape is eliminated by the use of fuel filler neck cap and the FLW assembly has the responsibility of controlling the flow of fuel vapor and prohibiting the entry of liquid fuel into the EVAP lines in a case of a vehicle rollover. The FTP sensor triggers the purge valve where tank pressure is high, it also measures vacuum levels during testing. The EVAP system monitor in a vehicle will perform a 'running loss system leak test' in which the engine is started and tested for large leaks, before running the test to note the rate of decay as an indicator of minor leaks. For component replacement, there are the EVAP canister purge valve which at the removal, entails disconnecting the electrical connector and quick-connect couplings as well as releasing it from the mounting bracket. The EVAP canister assembly comprised different parts, and to check or replace any component, the negative terminal of the battery has to be disconnected, car has to be raised and some hoses and mounting bolts have to be disconnected or removed, and after installation, all the parts are refitted in the reverse order.