2014 Mustang GT Fuel Pump: The Complete Guide to Choosing and Replacing Your Pump

If you own a 2014 Ford Mustang GT, your fuel pump is a critical component that directly impacts performance, reliability, and engine longevity. The stock fuel pump in the 2011-2014 Mustang GT (5.0L Coyote engine) delivers adequate fuel pressure for daily driving, but it can become a weak link when you add performance upgrades like a supercharger, turbocharger, or even a simple tune . Upgrading to a high-performance fuel pump is often the first step to safely support increased horsepower, whether you're running on pump gas or E85 ethanol. This guide covers everything you need to know about selecting the right fuel pump, installation tips, and what to expect from the replacement process.

Understanding Your 2014 Mustang GT Fuel Pump

The 2014 Mustang GT uses an in-tank electric fuel pump that is part of an integrated Fuel Pump Module Assembly (FPMA). This assembly includes the pump itself, the fuel level sending unit, the filter sock, and the locking ring that secures it to the fuel tank . The factory pump operates at a pressure range of 55-65 PSI and is designed to handle the demands of the stock 5.0L V8 engine .

When you start modifying your Mustang, the limitations of the stock pump become apparent. A basic cold air intake and tune can push the factory pump to its limits, and forced induction setups require significantly more fuel flow . This is why many owners look to aftermarket options that provide higher flow rates and better reliability.

Signs You Need a New Fuel Pump

Before you replace the pump, it's important to confirm that the fuel pump is actually the problem. Common symptoms of a failing fuel pump on a 2014 Mustang GT include:

1. Engine sputtering at high speeds or under load – The pump cannot maintain pressure when the engine demands more fuel.
2. Loss of power when accelerating – Especially noticeable when merging onto highways or climbing hills.
3. Difficulty starting – The engine cranks but takes longer than usual to fire up.
4. No start condition – The pump fails entirely, and you hear no priming sound when turning the key to the "ON" position.
5. Fuel pressure trouble codes – Using an OBD-II scanner, you may see codes like P0087 (low fuel rail pressure) .

Always perform a fuel pressure test using a gauge connected to the Schrader valve on the fuel rail. For a 2011-2014 Mustang GT, key-on engine-off pressure should be around 35-40 PSI, and it should hold steady . If the pressure is low or drops quickly, the pump is likely the culprit.

Fuel Pump Options for 2014 Mustang GT

There are several high-quality aftermarket fuel pumps available for the 2011-2014 Mustang GT, each designed for different power levels and fuel types. Here are the most popular options:

1. DeatschWerks DW400 (415 LPH)
This is one of the highest flowing in-tank pumps on the market, delivering 415 liters per hour at 40 PSI . It supports up to 1,000 horsepower on gasoline and 750 horsepower on E85 . The DW400 is a drop-in replacement that uses your stock fuel pump assembly, but note that it is wider than the factory pump, so some trimming of the module may be necessary for proper fitment . It features a rugged plated steel body and corrosion-resistant internal components, making it fully compatible with E85 ethanol .

2. DeatschWerks DW440 (440 LPH)
For extreme builds, the DW440 brushless pump offers 440 liters per hour and is designed for use with a single or dual controller . This pump is ideal for high-horsepower applications where maximum fuel flow is required.

3. Ti Automotive Competition Fuel Pump Module (TU2037HP)
This is a complete drop-in module featuring PACE award-winning DCSS fuel pump technology . It is E85 Flex Fuel compatible and engineered with an active fill system to support additional pump output. It can support up to 650 horsepower in naturally aspirated applications . The module is designed for plug-and-play operation, making installation straightforward.

4. Livernois Motorsports Drop-In Fuel Pump Assembly
Livernois offers a complete fuel pump assembly that installs directly into the OEM fuel tank . It is designed for 2011-2014 Ford Mustang GT with the 5.0L naturally aspirated engine and is built to handle basic performance upgrades without the need for extensive modifications .

5. Ford Motorcraft Fuel Pump (PS-940)
If you prefer an OEM replacement, the Motorcraft fuel sender and hanger assembly (part number PS-940) is a direct fit for your 2014 Mustang GT . This is a reliable option if you are not chasing high horsepower and simply need a factory-quality replacement.

The Installation Process

Replacing the fuel pump on a 2014 Mustang GT is a moderate DIY job that requires 4-6 hours and a safe workspace . Here is a step-by-step overview:

Step 1: Relieve Fuel System Pressure
Start with a cold engine. Locate the fuel pump inertia switch (usually in the trunk or passenger footwell) and disconnect its electrical connector. Try to start the engine; it will crank but not start, relieving the pressure in the fuel lines . After a few seconds of cranking, turn the ignition off and reconnect the inertia switch connector.

Step 2: Disconnect the Battery
Always disconnect the negative terminal of the battery before working on the fuel system to prevent any sparks .

Step 3: Drain the Fuel Tank
You must drain the fuel tank before lowering it. Use a siphon pump to remove as much fuel as possible through the filler neck into an approved gas can. A tank that is even one-quarter full is dangerously heavy and difficult to handle .

Step 4: Lower the Fuel Tank
Support the tank with a transmission jack or a sturdy piece of wood on a floor jack. Remove the bolts securing the tank straps, then carefully lower the tank a few inches. This gives you access to the electrical connector and fuel lines on top of the tank. Use fuel line disconnect tools to separate the lines, then lower the tank completely .

Step 5: Remove the Old Pump Assembly
With the tank on a stable surface, you will see a large plastic or metal lock ring securing the pump module. Use a brass punch and hammer to gently tap it loose (brass is non-sparking). Once loose, unscrew it by hand and carefully lift the pump assembly out of the tank. Be mindful of the float arm for the fuel level sender .

Step 6: Install the New Pump
Transfer the fuel level sender unit to the new pump assembly if it is separate, or install the complete new module. Lubricate the new large O-ring with a thin film of fresh gasoline or silicone grease, and carefully seat it into the tank. Hand-tighten the lock ring, then use a torque wrench to secure it to the manufacturer's specification (commonly around 40-50 ft-lbs) .

Step 7: Reassemble and Test
Reverse the procedure: raise the tank, reconnect the fuel lines and electrical connector, reinstall the straps, and reconnect the filler neck hose. Refill the tank with a few gallons of gas, reconnect the battery, and turn the key to the "ON" position. Listen for the fuel pump priming sound. Start the engine and check for any fuel leaks .

Why You Should Consider KEMSO Fuel Pump

When it comes to replacing your 2014 Mustang GT fuel pump, we highly recommend KEMSO Racing for a reliable, high-performance solution. KEMSO fuel pumps are designed as direct OEM replacements, meaning they fit perfectly into your factory fuel tank without modifications. Their pumps are built with high-quality materials and offer lifetime warranty, giving you peace of mind that your investment is protected.

KEMSO pumps are engineered to deliver consistent fuel flow and pressure, whether you are running a stock engine or a heavily modified setup. They are corrosion-resistant and compatible with E85 ethanol, making them a versatile choice for any build. Choosing KEMSO means you get performance, reliability, and warranty support all in one package.

To learn more about KEMSO fuel pumps and find the right model for your 2014 Mustang GT, visit their official website: https://www.kemsoracing.com/.

Final Recommendations

Upgrading the fuel pump on your 2014 Mustang GT is one of the most important steps you can take to ensure your engine gets the fuel it needs, especially if you plan to add performance modifications. Whether you choose a high-flow aftermarket pump like the DeatschWerks DW400 or a complete drop-in module from Ti Automotive, make sure the pump is compatible with your power goals and fuel type.

Always replace the fuel filter and O-rings when installing a new pump to prevent future issues . If you are not comfortable dropping the fuel tank, consider having a professional mechanic perform the installation. A properly functioning fuel pump is essential for the longevity and performance of your Mustang's 5.0L Coyote engine.

For the best combination of quality, performance, and warranty, visit KEMSO Racing at https://www.kemsoracing.com/ to find the perfect fuel pump for your 2014 Mustang GT.