On 3 Performance 03-04 Cobra Design Baffled Gas Tank (1987 - 2004 Mustang)

Upgrade your Mustang’s fuel system with the On 3 Performance Baffled 03/04 Cobra Design Fuel Tank, engineered for 1986–2004 Ford Mustangs including Foxbody, SN95, and New Edge models. Unlike standard fuel tanks, this advanced baffled design keeps fuel consistently around the pump assembly, preventing dangerous fuel starvation during hard acceleration, sharp cornering, drifting, or road racing.

Fuel slosh in stock tanks can lead to pressure loss and catastrophic engine failure, especially in high-horsepower or power-adder builds. With On 3’s baffled center design, fuel remains where your pumps need it most, delivering consistent pressure and reliability even under extreme G-forces.

Pair this tank with the On 3 Performance billet fuel hat and triple 340lph pumps, and you’ll have a stealthy, nearly silent fuel system capable of supporting 1,000+ rear-wheel horsepower. The tank is compatible with factory filler necks and emissions components on 1999–2004 Mustangs, while earlier models (1986–1998) may require simple filler neck modifications for proper fitment.

Whether you’re building a drag racing monster, road course Mustang, or street sleeper, this Cobra-style baffled fuel tank is the ultimate upgrade for fuel delivery and long-term engine protection.

Key Features:

• Direct fit for 1986–2004 Mustangs (with minor filler neck mods on earlier years)

• 03/04 Cobra baffled design to prevent fuel starvation

• Supports over 1000 rwhp with On 3 billet fuel hat & pumps

• Stealth operation with pumps fully housed inside the tank

• Ideal for drag racing, drifting, and high-G road course driving

• Works with stock 99–04 filler necks, fuel assemblies, and emissions

DETAILS FOR INSTALLING INTO THE VARIOUS YEAR MUSTANGS: 1986 - 1997 MUSTANG: On these model years, you will have to modify a 1999+ filler neck to keep the factory fill function. The 96 and 97 cars as well as possibly the 94 and 95, which we have not verified can just directly swap out to the 98+ filler neck. The 1986- 93 will need a 98+ filler neck and mainly will take 2 cuts. It is a very simple modification to have this new generation fuel tank in your foxbody. If the car does not have evap, the hole is in the tank for that and either would need plugged or welded shut. As far as the fuel pump assembly goes, we would recommend our custom billet fuel hat + fuel level sensor which is $328. Another option is that you could run one of the factory fuel assemblies from say the 03 Cobra. 

1994-97 MUSTANG: The filler neck info will apply to you as far as we know but a few guys have said you just can swap to the 98+ filler neck. I have not confirmed but hopefully we will get feedback to update this information. You will also want to either run our fuel hat assembly or the factory style pump holders from the 99+ cars. 99-04 MUSTANG: Your filler neck, fuel assembly and emissions components will all transfer right over to this tank.  

Includes: 1 - On 3 Performance 03 / 04 Cobra Designed Baffled Fuel Tank