The Timberville Police Department warned of a scam that can be installed onto a gas pump with just a screw. (Timberville Police Department via Facebook) A Virginia police department is warning drivers about a new way scammers are trying to rip off people when they fill their tanks: the gas pump screw scam.The Timberville Police Department explained the scammers would place a screw or some other object in a fuel pump handle cradle. The item would…