Fuel systems aren’t sexy... but they are essential. Without proper fueling, your build is toast. DON’T SKIMP ON FUELING (seriously).
Need fast answers? Try our Fuel System Wizard below or jump straight to your Mustang's generation below. We also recommend reviewing our Fuel System FAQ and checking out our full DivisionX lineup.
Use the following info to help you decide which of our Mustang fuel systems fits your needs the best.
Applications: 1999–2004 Mustang GT
Horsepower: Up to 750 HP
Fuel Rails: No
Feed Line: Not included
Return Line: 6an
Notes: Requires level sender bracket or 03–04 Cobra sender
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Applications: 1999–2001 Cobra, 2003–2004 Cobra, 2003–2004 Mach 1
Horsepower: Up to 750 HP
Fuel Rails: No
Feed Line: Not included
Return Line: 6an
Notes: Level sender bracket required for accurate readings
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Applications: 1999–2001 Cobra, 2003–2004 Cobra, 2003–2004 Mach 1
Horsepower: Up to 850 HP
Fuel Rails: No
Feed Line: 10an to Y-block, 8an to rails
Return Line: 8an
Notes: Higher flow; same fitment as standard Budget
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Applications: 1999–2004 GT, Cobra, Mach 1
Horsepower: 850–1400 HP
Fuel Rails: Yes
Feed Line: 10an
Return Line: 8an
Notes: Sender bracket needed for GT/Mach 1
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Applications: 1999–2004 GT, Cobra, Mach 1
Horsepower: 1200–2000 HP
Fuel Rails: Yes
Feed Line: 10an
Return Line: 8an
Notes: Built for serious race/boosted builds
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Applications: 2007–2014 Shelby GT500
Horsepower: Up to 2000 HP
Fuel Rails: Yes
Feed Line: 10an
Return Line: 6an
Notes: Level sender bracket required for 2010–2012 with OEM sender
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Applications: 2010–2012 Shelby GT500
Horsepower: Up to 2000 HP
Fuel Rails: Yes
Feed Line: 10an
Return Line: 8an
Notes: Uses post-rail regulator; sender bracket required with OEM sender
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Applications: 2013–2014 Shelby GT500
Horsepower: Up to 2000 HP
Fuel Rails: Yes
Feed Line: 10an
Return Line: 8an
Notes: Traditional regulator layout; plug-and-play for Whipple or turbo
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Applications: 2011–2017 Mustang GT, 2012–2013 Boss 302
Horsepower: Up to 1000 HP
Fuel Rails: No
Feed Line: 8an
Return Line: 6an
Notes: Ideal for Whipple/Roush boosted street builds
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Applications: 2011–2017 Mustang GT, 2012–2013 Boss 302
Horsepower: Up to 1200+ HP
Fuel Rails: Yes
Feed Line: 8an
Return Line: 6an
Notes: Dual/triple pump support, flexible for big builds
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Applications: 2015–2017 Mustang GT
Horsepower: 850–2000 HP
Fuel Rails: Yes
Feed Line: 10an
Return Line: 8an
Notes: PTFE lines, modular pump options, Whipple/turbo ready
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Applications: 2018–2023 Mustang GT
Horsepower: Up to 1000 HP
Fuel Rails: Yes
Feed Line: 10an
Return Line: 8an
Notes: Gen 3 Coyote, stock manifold builds, pump gas or E85
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Applications: 2018–2023 Mustang GT
Horsepower: 800–2000+ HP
Fuel Rails: Yes
Feed Line: 10an
Return Line: 8an
Notes: Designed for Whipple/turbo Gen 3 Coyotes, flex fuel capable
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Applications: 2024+ Mustang GT / Dark Horse
Horsepower: Up to 1000 HP
Fuel Rails: Yes
Feed Line: 10an
Return Line: 8an
Notes: Designed for Gen 4 Coyote, stock manifold, pump gas or E85
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Applications: 2024+ Mustang GT / Dark Horse
Horsepower: 800–2000+ HP
Fuel Rails: Yes
Feed Line: 10an
Return Line: 8an
Notes: Ideal for Whipple/turbo Gen 4 Coyotes, high-boost E85 setups
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Applications: 2016–2020 Shelby GT350
Horsepower: Up to 1200 HP
Fuel Rails: Yes
Feed Line: 10an
Return Line: 8an
Notes: Built for high-RPM, high-boost Voodoo 5.2L applications
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Applications: 2020–2022 Shelby GT500
Horsepower: 800–1600+ HP
Fuel Rails: Yes
Feed Line: 10an
Return Line: 8an
Notes: Predator 5.2L ready, E85/race gas capable, plug-and-play
View ProductReturnless systems regulate fuel pressure in the tank. Return-style systems recirculate fuel and regulate pressure at the rails, improving consistency under boost and supporting high-output builds. All Lethal Performance systems are return-style conversions.
Use our Fuel System Wizard to select your Mustang's year and power goals. You can also browse product cards above or contact us. Need a quick overview? 750 HP = Budget; 850–1200 HP = Dual pump; 1200+ HP = Triple pump.
Deadhead systems regulate pressure before the rails. Traditional systems regulate pressure after the rails and return excess fuel to the tank. Traditional setups are often preferred for boosted or high-RPM builds.
Yes, especially for E85, boosted builds, or Gen 3+ Coyotes. DivisionX billet rails are included in most higher-power kits and support AN fittings and better flow.
Up to 800 HP: 8an feed / 6an return. 800–1200 HP: 10an feed / 8an return. 1200+ HP or E85: dual 10an feed / 10an return recommended.
PTFE is ethanol-safe, heat-resistant, and leak-resistant. It's ideal for E85 and high-temp applications. Most DivisionX systems now include PTFE braided lines.
Yes. All Lethal fuel systems are compatible with pump gas, race gas, and ethanol. Make sure your injectors and pumps are sized accordingly — E85 requires more volume.
Depending on power level: fuel hat, pumps, wiring, regulator, PTFE lines, fuel rails, Y-block, fittings, filters, and clamps — all pre-sized and ready to install.
Not with our return-style systems. High-output pumps are included. A BAP is only a bandaid for returnless systems or stock wiring limitations.
Yes. All systems support flex fuel sensors and tuning with RTD4 or custom ECU maps. Just size injectors for your max fuel demand (especially on E85).
Each product card links to its install guide. You can also browse our full library of diagrams and instructions here:
Fuel System Installation Instructions