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 fuel filter itself is in theWhat number is the fuse for the fuel pump on Ford MustangWhere is the fuse for the fuel pump located on a 1999 FordWhere is the fuel filter on 1999 Ford - answersHow do you replace the fuel filter located on a Ford Mustang?See more results 1999 Ford Mustang Replacement Fuel Filters – CARiD Harmful impurities in fuel can plug injectors and reduce performance in your 1999 Ford Mustang. Trap them before they can inflict damage with our replacement fuel filter.