How to Install a Fuel Filter in a 2003 Ford Mustang | It The 2003 Ford Mustang is a fuel-injected pony car and one of the most recognizable Ford vehicles in the 2003 model year. The Mustang's fuel-injection system relies on the fuel pump and fuel filter to supply the fuel rail and injectors with clean gasoline in order to keep this stallion in motion. 2003 Ford Mustang Fuel Filter - AutoZone Equip cars, trucks & SUVs with 2003 Ford Mustang Fuel Filter from AutoZone. Get Yours Today! We have the best products at the right price.