Original sentence: As the vapors are inferior to the full composition of modern automotive gasoline, this can result in poorer fuel being supplied- and fuel pumped by customers after the fuel pump initially shuts off where a highly baffled fuel tank is not simply taking time to completely fill up.Vapor recovery systems typically feed vapors back into the station's tanks
Edited sentence: As the recovered vapors are inferior to the full composition of modern automotive gasoline, this can result in poorer fuel being supplied if the tank is topped up after the pump has automatically shut-off.The negative pressure created in the (underground) tank by the withdrawal is usually used to pull in the vapors.The process consists of a closed venting system from the storage tank ullage space to a vapor recovery unit (VRU) which will recover the vapors for return to the process or destroy them, usually by oxidation.The vapors are usually either environmentally hazardous, or valuable to be recovered.They are drawn-in through holes in the side of the nozzle and travel through special hoses which have a return path.Vapor recovery is also used in the chemical process industry to remove and recover vapors from storage tanks