Mustang Return Style Fuel System

The On3 Performance (1987-2004) Mustang Return Style Fuel System offers a streamlined, high-performance fuel delivery solution, replacing the need to source individual components. This E85 compatible system is built around dual 320lph fuel pumps, collectively supporting up to 1000 horsepower, ensuring ample fuel supply for modified engines. Central to the system is the On3 Performance CNC billet fuel hat, machined from solid 6061 aluminum. Its innovative two-piece construction routes all fuel pumps to a single port, creating a cleaner installation by eliminating external Y-blocks and welding. This design is also more slim, preventing interference with the spare tire area. The system exclusively uses On3 Performance O-ring fittings, which simplify installation, prevent leaks associated with pipe threads, and require minimal torque for a secure seal. These fittings are anodized black, providing durability and resistance to corrosion, especially when using E85 fuel. Included in the kit is a custom baffled fuel tank, the billet fuel hat, two 340lph fuel pumps, an in-line fuel filter, a 23-piece anodized black fitting kit, a 10AN black braided feed line, and an 8AN black braided feed/return line. A billet 1:1 boost-referenced fuel pressure regulator with 8AN ORB ports is also part of the package. Customers will need to source their own fuel rails, ensuring the inlet and outlet are plumbed to match the kit's design for optimal compatibility. For 1987-1995 Mustang owners, the tank will bolt in using stock straps, but the filler neck will require modification from a 1996-2004 model. On3 Performance can provide photos for this process. If the fuel tank is deleted from the kit, the fuel hat is only compatible with 1999+ GT and 2003-2004 Cobra tanks. The baffled fuel tank requires a 2003-2004 Cobra style fuel level sender (PART # 2R3Z9275AAa). New orders as of June 1, 2026, will include pre-installed pumps with wiring epoxy and pre-installed wires for the fuel level sender.