The Fox Body Mustang is a performance icon, but its factory fuel system is a well-known weak point for any serious build. At SEMA 2025, Holley just showcased the definitive solution: a complete, drop-in Fox Mustang Fuel System kit. Designed for 1986-1993 fuel-injected 5.0-liter models, these kits (P/N 526-25) bundle everything you need to overhaul your car’s fuel supply, from the tank to the engine. It’s a complete package that includes the fuel pump module, filters, braided lines, regulator, fittings, and even a new wiring harness.
Power Any Build
Holley knows one size doesn’t fit all. Whether you have a stock engine or a high-output EFI build, this kit can handle it. It’s fully compatible with both pump gas and E85. You have the choice of either a 340- or 525-liter-per-hour fuel pump module, which pairs with a billet filter and an included fuel pressure regulator with a gauge. The kit provides 40 feet of -6AN or -8AN braided hose, all the necessary AN fittings, and EFI-rated clamps for a reliable, leak-free, and professional-looking installation.
Engineered for a Clean Install
The biggest headache with custom fuel systems is often fabrication. Holley designed this kit to be a direct replacement for the factory setup, using as much of the original chassis and sheet metal routing as possible. This means minimal to no drilling is required, allowing the system to integrate neatly with your Mustang’s factory layout. The result is an incredibly clean, OEM-style appearance without the custom fab work nightmare.
A Reliable Holley Fox Mustang Fuel System
A high-flow pump is useless without the electrical power to back it up. Holley’s kit includes a new electric fuel pump harness and relay wiring kit. This ensures the pump receives the proper, steady amperage it needs to operate at its peak. This new harness is key to improving reliability and keeping your fuel pressure solid under all driving conditions, especially under heavy boost or at wide-open throttle.
The All-in-One Solution
This new Fox Mustang Fuel System kit from Holley finally takes the guesswork out of the equation. You no longer have to hunt down mismatched components or worry about plumbing and wiring compatibility. With detailed, step-by-step instructions, Holley handles it all. For anyone restoring, modifying, or building a Fox Mustang for the street or track, this combination of performance and ease of installation is a game-changer.
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