Best Fuel Pumps for the 2015-2017 Ford Mustang GT 5.0

The best fuel pump for the 2015-2017 Ford Mustang GT 5.0 is the DeatschWerks X2 Series dual-pump module — a direct, drop-in upgrade that gives the Coyote the fuel volume a supercharger, turbo kit, or E85 tune demands. The factory S550 in-tank pump was sized for the stock 435 horsepower, and it is the first hard wall most built Coyotes hit. In our Tampa shop we see it every week: a clean dyno pull that falls flat up top because the fuel system runs out of volume before the engine runs out of airflow. This guide compares four in-tank fuel pump upgrades we actually sell and install — from a $227 single pump to a plug-and-play brushless assembly — so you can size the right one for your power goal and your fuel.

Why the 2015-2017 Mustang GT Needs a Fuel Pump Upgrade

A fuel pump upgrade is the in-tank pump that replaces the factory unit to deliver more fuel volume — measured in liters per hour (LPH) — for an engine making more power than stock. The 2015-2017 Mustang GT ships with the 5.0L Coyote V8 rated at 435 horsepower and 400 lb-ft of torque, and Ford sized the returnless, PWM-controlled fuel system to feed exactly that. The stock in-tank pump flows in the ~255 LPH class, which is plenty for a factory car and even light bolt-ons, but it has very little reserve once you add boost or switch fuels.

Here is the number that matters: a 93-octane street tune on a bolt-on Coyote still lives comfortably on the stock pump up to roughly 500-550 wheel horsepower. Add a supercharger kit (Roush, Whipple, or VMP territory at 650-750+ whp) or switch to E85, and fuel demand jumps past what the factory pump can supply. E85 is the big one — because its stoichiometric ratio is about 9.8:1 versus 14.7:1 for gasoline, an E85 engine needs roughly 30% more fuel volume to make the same power. A car that is happy on 93 can go lean and dangerous on E85 with the same pump. Upgrading the in-tank pump is the cheapest insurance you can buy before chasing big numbers.

Best Fuel Pumps for the 2015-2017 Mustang GT 5.0

Every pump below is a true in-tank, drop-in upgrade for the S550 GT — no surge tank, no external pump, no fabrication. We ranked them by how well each matches a real power goal and budget. All four are E85-compatible, which is the whole point of upgrading a Coyote fuel system.

1. DeatschWerks X2 Series Dual-Pump Module — Top Pick

The X2 is the fuel system we put under a built Coyote that is headed for a blower or a serious E85 tune. Instead of one pump, it packages two in-tank pumps into a single factory-style hanger, so it carries far more flow headroom than any single-pump setup here while still dropping straight into the S550 tank. For 2015-2017 GT owners planning 700-plus wheel horsepower, or anyone running E85 where volume demand climbs ~30%, the dual-pump layout is the honest answer. At around $396 it is also the best flow-per-dollar on this list, which is why it earns our top pick.

2. DeatschWerks DW400 415 LPH Single Pump — Best Budget

The DW400 is the pump we recommend most often for a 2015-2017 GT that is not going to be a 700-plus car. It flows 415 LPH at 40 psi — a massive jump over the factory ~255 LPH unit — and comes with the vehicle-specific 9-1047 install kit (including the 1/8-inch venturi) so it drops in without guesswork. A single DW400 supports roughly 650-700 wheel horsepower on pump gas and comfortably feeds a mild E85 build. At around $228 it is the most fuel-flow-for-the-money upgrade on the S550, and the clear budget pick here.

3. DeatschWerks DW440 440 LPH Brushless — Best Brushless Value

The DW440 is the smart pick if you want brushless technology without a premium price. It flows 440 LPH and ships with a single/dual speed controller and the 9-0906 install kit for the 2015+ Mustang GT (the same pump also covers the 2015-2021 F-150). Brushless pumps draw less current, run noticeably cooler, and are quieter than a brushed pump at the same flow — and the included controller lets you dial pump speed to demand instead of running it flat-out all the time. At around $432 it splits the difference between the budget DW400 and the premium Aeromotive assembly.

4. Aeromotive 450 LPH Stealth (TVS) — Premium Plug-and-Play

The Aeromotive 450 Stealth assembly is the premium, no-compromise option for the 2011-2017 Mustang. It is a complete in-tank hanger with a 450 LPH brushless pump and Aeromotive's True Variable Speed (TVS) controller, which uses pulse-width modulation to match pump output to engine demand — cutting heat, noise, and current draw while keeping fuel cool in the tank. It is the most expensive single-pump option here at around $731, and worth it for owners who want a clean, engineered, bolt-in assembly rather than a loose pump and install kit. Note Aeromotive lists this assembly as non-CARB (off-road/competition use), so confirm your local emissions rules before buying.

2015-2017 Mustang GT Fuel Pump Comparison

Here is how the four fuel pumps compare at a glance. Match the pump to your power target and fuel first, then budget — every option below is a direct in-tank fit for the S550 GT.

How Much Fuel Pump Do You Actually Need?

Size your pump to your power goal and fuel, not to the biggest number on the shelf. As a working rule for the Coyote, a single 415-450 LPH in-tank pump supports roughly 650-700 wheel horsepower on pump gasoline and about 500-550 wheel horsepower on E85, because E85 needs more volume per horsepower. A dual-pump module like the X2 roughly doubles that ceiling, which is why it is the go-to for high-boost and flex-fuel cars that see both fuels.

Three quick scenarios we see in the shop: a naturally aspirated or bolt-on 2015-2017 GT making 450-500 whp on 93 is fine on a single DW400. A supercharged Coyote targeting 650-750 whp on pump gas is squarely in single-pump DW440 or Aeromotive 450 territory. A dedicated E85 or high-boost build chasing 700-plus whp should start with the X2 dual-pump module so fuel delivery is never the limiting factor. Remember the pump only moves fuel — you still need matching injectors, a supporting tune, and on big power a larger fuel line and regulator.

Pump Gas vs E85: How Fuel Choice Changes Your Pump

E85 is the single biggest reason to upgrade the S550 fuel pump, because it demands about 30% more fuel volume than gasoline for the same power. That shifts every number down: a pump that comfortably feeds 700 whp on 93 octane may only support 500-550 whp on E85. Ethanol is also harder on pump internals and seals, so a fuel pump upgrade for a flex-fuel Coyote must be E85-rated — all four pumps in this guide are. If you plan to run flex fuel and switch between 93 and E85, size the pump for the E85 number, not the pump-gas number, and give yourself margin with the DW440, Aeromotive 450, or the X2 module.

Installation Notes for the S550 GT

All four pumps are in-tank, drop-in upgrades, but the S550 GT accesses its pump from under the car, so plan on lowering the fuel tank rather than popping a hatch under the rear seat. Budget roughly 2-3 hours for an experienced installer, and run the tank low on fuel before you start to make it manageable. Each kit here ships with its vehicle-specific install hardware — the DW400 with the 9-1047 kit and venturi, the DW440 with the 9-0906 kit and controller, and the Aeromotive as a complete assembly. A pump swap alone does not require a tune, but the power it unlocks does, so pair any of these with the injectors and custom tune your build calls for. Our Tampa, FL shop installs these fuel systems regularly and can spec the full package — pump, injectors, lines, and tune — for your power target.