LEAKAGE DIAGNOSIS SUPPLEMENT METHOD FOR FAILURE OF VACUUM PUMP USING ACTIVE PURGE PUMP AND LEAKAGE DIAGNOSIS SUPPLEMENT SYSTEM FOR FAILURE OF VACUUM PUMP USING ACTIVE PURGE PUMP

A leakage diagnosis supplement method for a failure of a vacuum pump using an active purge pump may include: determining whether or not the vacuum pump mounted on a vent line between a canister and an atmosphere fails; reverse-rotating the active purge pump mounted on a purge line connecting the canister and an intake pipe to each other; determining whether or not an absolute value of internal pressure in a fuel tank is less than a specific value; and checking a leakage in the fuel system including the canister and the fuel tank.