Where is the fuel filter located on a 1999 Ford Mustang? Where is the fuel filter located on a 1999 Ford Mustang? It is an in-line fuel filter located behind the rear bumper. It's a steel line that will have a module connected to it. Basically, the fuelHow do you change a fuel filter on a 2000 Ford Mustang?Where is the fuse for the fuel pump located on a 1999 FordWhere is the fuel filter on a 1999 mustang 3.8 - answersHow do you replace the fuel filter located on a Ford Mustang?See more results 1999 Ford Mustang Replacement Fuel Filters – CARiD Ford Mustang 1999, In-Line Fuel Filter by Hastings®. With 5/16" Inlet/Outlet. This filter is designed to protect fuel system components, such as injection pumps and injectors, from damaging contaminants, including water, bacteria,..