The Aeromotive Stealth 340lph fuel pump has become a go-to upgrade for Dodge Challenger Hellcat owners who want reliable fuel delivery without breaking the bank. Factory fuel systems in the Hellcat are adequate for stock power levels, but once you start adding boost, bigger injectors, or E85, the stock pump quickly runs out of headroom. The Stealth 340 is designed to drop into the factory fuel module with minimal modification, making it a popular choice for enthusiasts chasing serious horsepower numbers. In this review, we’ll cover the pump’s construction, real-world power gains, a detailed installation walkthrough for the Hellcat, and tuning considerations to help you get the most out of your upgrade.

Overview of the Aeromotive Stealth 340lph Fuel Pump

The Aeromotive Stealth 340 is an in-tank electric fuel pump rated at 340 liters per hour (LPH) at a standard operating pressure. This puts it well above the output of the OEM pump, which typically flows around 250 LPH at 58 psi. The Stealth 340 is built for high-flow, high-pressure applications and supports gasoline as well as ethanol blends up to E85 when used with compatible ethanol-rated components. It uses a brushless DC motor design for efficiency and longevity, and it is fully submersible inside the fuel tank, which helps keep it cool and quiet during operation.

Key specifications include a free-flow rate of 340 LPH, a maximum pressure rating of 90 psi, and an operating voltage of 12-14 volts. The pump comes with a range of inlet and outlet fittings to match most factory hanger setups, including the Hellcat’s 5/16″ fuel line. Aeromotive also supplies the pump with a foam isolating sleeve to minimize vibration and noise inside the tank. For the Challenger Hellcat specifically, the pump fits inside the factory fuel module without requiring any permanent modifications to the tank or module assembly, which means you can return to stock if needed.

Why the Hellcat Needs a Fuel System Upgrade

The Dodge Challenger Hellcat comes from the factory with a supercharged 6.2L HEMI that makes 707-717 horsepower depending on the model year. The fuel system includes a single in-tank pump, fuel lines, and injectors sized for E30-compatible calibration on some later years, but the pump itself is the primary bottleneck when adding power. With a smaller upper pulley, a tune, and cold air intake, the Hellcat can easily exceed 800 wheel horsepower. At that level, the stock pump drops fuel pressure under sustained boost, leading to lean conditions and potential engine damage. The Aeromotive Stealth 340 provides the flow headroom needed to support these modifications safely.

Power Gains and Performance Expectations

Simply swapping the fuel pump alone will not increase horsepower by itself—the pump does not add power, it enables power. If you have already made other modifications that increase fuel demand, the Stealth 340 will ensure consistent fuel pressure and volume, which directly supports higher power levels. On a stock Hellcat, you will not see a dyno gain because the engine is not asking for more fuel. However, once you add a pulley, tune, E85, or a larger throttle body, the pump becomes a critical enabler.

In typical Hellcat builds with a 2.85″ or 2.75″ upper pulley and a 93-octane or E85 tune, the Stealth 340 supports up to approximately 850-900 wheel horsepower on gasoline and around 900-950 on E85. For comparison, the stock pump begins to fuel pressure decay around 700 wheel horsepower. Users report that after fitting the Stealth 340, fuel pressure stays rock-solid at 58 psi even during back-to-back dyno pulls. This consistency translates to stronger acceleration, stable air-fuel ratios, and reduced timing pulls due to knock. Many owners also notice a slightly smoother idle and better throttle response because the pump maintains adequate rail pressure during transient throttle events.

Real-World Dyno Results

Several Hellcat forums and performance shops have published dyno results directly comparing stock vs Stealth 340 fuel pumps on modified cars. One common test involves a Hellcat with a 2.85″ pulley, drop-in K&N filter, and a DiabloSport i3 tune running 93 octane. On the stock pump, the car made 770 wheel horsepower but saw fuel pressure drop to 52 psi at peak boost. After installing the Stealth 340, fuel pressure held steady at 58 psi, and the tuner was able to increase timing and boost, resulting in 810 wheel horsepower with a much safer air-fuel ratio. That is a 40-wheel horsepower gain directly attributable to the pump’s ability to supply adequate fuel. On E85 builds, the difference is even larger because ethanol requires up to 30% more fuel volume.

It is important to note that power gains from the pump alone vary based on the rest of your setup. If your fuel system was already maxed out, the Stealth 340 will unlock previously unattainable power. If you are still mostly stock, the pump is insurance for future modifications.

Fuel Compatibility and E85

The Aeromotive Stealth 340 is rated for use with both gasoline and ethanol blends, including E85. However, E85 contains more ethanol, which can degrade certain rubber components and line the fuel system. Aeromotive provides PTFE-lined hoses and Viton seals in the pump assembly to resist ethanol attack. For a full E85 conversion on the Hellcat, you may also need to upgrade the fuel lines and injectors, but the pump itself will handle the flow. Many tuners recommend the Stealth 340 as part of an E85 package for the Hellcat because it offers a shorter path to higher power without the complexity or cost of a dual-pump or external pump setup.

Installation Process for the Dodge Challenger Hellcat

Installing the Aeromotive Stealth 340 in a Challenger Hellcat is a straightforward job that can be completed in a few hours with basic mechanical skills. The pump fits inside the factory fuel module, which is accessed through a removable panel under the rear seat. The following step-by-step guide covers the entire process, including safety precautions, tool list, and tips from experienced installers.

Tools and Materials Needed

  • Safety glasses and mechanic's gloves
  • Battery terminal socket (10mm) to disconnect the negative battery cable
  • Torx T20 and T30 drivers for the rear seat and module cover screws
  • Fuel line disconnect tool set (3/8″ and 5/16″ for Chrysler quick-connects)
  • Trim removal tool or flathead screwdriver to release the module locking ring
  • Shop towels or rags to catch residual fuel
  • Fuel-safe O-ring grease for the module seal
  • Aeromotive Stealth 340 pump kit (includes pump, sleeve, harness adapter, and instructions)
  • Optional: replacement fuel filter (fuel pressure regulator) if your Hellcat has an in-tank filter sock

Pre-Installation Safety and Fuel Pressure Relief

Before you begin, work in a well-ventilated area away from ignition sources. Disconnect the negative battery terminal to eliminate the risk of sparks or electrical short circuits. The fuel system is under high pressure (around 58 psi) and must be depressurized. Locate the fuel pump fuse in the interior fuse box (position F59 in most models). Remove the fuse, then start the engine and let it run until it stalls—this relieves the line pressure. After the engine stalls, crank it for a couple more seconds to ensure all residual pressure is gone. Then disconnect the battery positive terminal as well for extra safety during the fuel module removal.

Step 1: Remove the Rear Seat

Fold down the rear seatbacks. There are two clips at the front of the bottom seat cushion; push them inward and lift the cushion upward to release it. The cushion will slide forward, and you can remove it entirely. In the center of the floor pan, you will see a sheet metal access cover with four plastic push-pins. Pry the pins up using a trim tool, then lift the cover. Underneath is a metal splash shield held by two 10mm bolts; remove those to expose the fuel pump module top.

Step 2: Disconnect Fuel Lines and Electrical Connector

The fuel pump module top has three quick-connect fuel lines (supply, return, and vent) plus a large electrical connector. Clean any dirt around the connections before disconnecting. Use the appropriate fuel line disconnect tool for each fitting. Slide the tool over the line, press inward, and pull the line off. Have rags ready as a small amount of fuel may spill. Label each line for reassembly, though the connectors are typically keyed and cannot be swapped. Unclip the electrical connector by pressing the release tab. Carefully set the lines aside, keeping them out of the way.

Step 3: Remove the Fuel Pump Module

Using a trim tool or a large flathead screwdriver, turn the locking ring counterclockwise to release it. The ring may be tight; apply steady pressure. Once the ring spins freely, remove it by hand. Lift the fuel pump module straight up and out of the tank. The module contains the pump, fuel level sender, and pressure regulator. Place it on a clean work surface. Note the orientation of the pump within the module—take photos if needed. Carefully note the position of the rubber gasket that seals the module to the tank; keep it clean and free of debris.

Step 4: Replace the Pump with the Aeromotive Stealth 340

Disassemble the module by removing the factory pump. On the Hellcat, the pump is attached to the module bracket with a retaining clip and a rubber boot. Slide the OEM pump out of its mounting grommets. The Stealth 340 comes with a custom-fit sleeve that interfaces with the module’s internal supports. Install the pump into the sleeve, ensuring the inlet screen (if included) is properly seated. Orient the pump so the electrical terminals point toward the module’s harness connector. Secure the pump using the provided mounting clips. Reconnect the module’s internal wiring pigtail to the pump terminals (match positive and negative). Apply a thin layer of O-ring grease to the large module gasket to ensure a good seal.

Step 5: Reinstall the Module and Reconnect Lines

Lower the module back into the tank, aligning the locking ring slots. Press down evenly and install the locking ring, turning it clockwise until it clicks into place. Verify the ring is fully seated—it should not rock. Reconnect the fuel lines by pushing each one onto its fitting until you hear a click. Reconnect the electrical connector. Ensure no fuel line is kinked or pinched.

Step 6: Reinstall Splash Shield, Seat, and Battery

Replace the metal splash shield and secure it with the two 10mm bolts. Install the plastic access cover and push the pins down. Reinstall the rear seat cushion, pressing it down until the clips engage. Reconnect both battery terminals (positive first, then negative—or follow the reverse order of disconnection for safety).

Step 7: Prime the Fuel System and Check for Leaks

Turn the ignition key to the ON position (without starting the engine) for about 10 seconds to allow the pump to prime. You may hear the pump run briefly. Turn the key OFF, then ON again. Repeat this cycle twice. Check all fuel line connections for leaks. Then start the engine and let it idle for two minutes. Visually inspect the module top, fuel lines, and the area around the rear seat for any fuel leaks. If everything is dry, take a short test drive, then recheck under the car and inside the cabin. Retorque the battery terminals to 9-11 Nm.

Common Mistakes and Tips

  • Always use the correct fuel line disconnect tool. Prying with a screwdriver can damage the quick-connect fitting.
  • Do not let the fuel pump run dry after installation; ensure the tank has at least 1/4 tank of fuel to avoid cavitation.
  • If you are installing the pump on a cam-only or E85 setup, consider upgrading your fuel injectors and fuel lines to match the flow capacity.
  • Label the factory wiring harness orientation to avoid reversing polarity—reverse polarity will damage the pump.
  • Test the fuel pressure after installation using a mechanical gauge. The Stealth 340 should maintain 58 psi at idle and under load.

Alternative Fuel Pump Options for the Hellcat

While the Aeromotive Stealth 340 is an excellent mid-range upgrade, it is not the only option. Here are a few alternatives to consider based on your power goals and budget:

  • Stock Pump + Bypass Regulator: Some owners run a boost-referenced fuel pressure regulator to raise pressure under boost, extending the stock pump’s capability slightly. This is a cheap band-aid but not reliable for sustained high power.
  • Walbro 525: A popular drop-in pump similar to the Stealth 340 but with higher flow (525 LPH). It supports up to 1,000 wheel horsepower on gasoline and is compatible with the Hellcat fuel module with a conversion kit. However, it draws more current and may require a wiring harness upgrade.
  • Fore Innovations Twin Pump System: A full external twin-pump setup with a surge tank that supports over 1,200 wheel horsepower. This is a much more expensive and complex installation, needed only for drag racing or extreme builds.

The Stealth 340 sits in a sweet spot for most street-driven Hellcats targeting 800-950 wheel horsepower. It offers a balance of flow, ease of installation, and cost.

Tuning Considerations After the Upgrade

Once the pump is installed, a proper tune is essential to take advantage of the increased fuel flow. Without retuning, the engine management system will still operate on the stock fuel map, and the extra capacity may cause the system to run rich at idle or part throttle because the pressure regulator may not be able to bleed off enough fuel volume. In some cases, the excess fuel can cause rough running or even flooding. A custom tune from a reputable Hellcat tuner will adjust the injector pulse widths and fuel pressure targets to match the new pump’s characteristics.

If you already have a tune for your other modifications, the tuner may only need to adjust the fuel pump voltage control (PWM) to prevent the pump from running at full speed all the time. The Hellcat’s PCM uses a variable voltage signal to the pump; the Stealth 340 works well with this system but may need a revised voltage table to maintain proper pressure at lower fuel demands. Many tuners simply set the pump to run at a constant 100% duty cycle, which is acceptable but can generate extra heat and noise. A better approach is to calibrate the PWM table to maintain 58 psi across all RPMs and load points.

Conclusion

The Aeromotive Stealth 340lph fuel pump is a proven upgrade for the Dodge Challenger Hellcat that delivers the fuel flow necessary to support 800-950 wheel horsepower on gasoline or E85. Its drop-in design, quick installation process, and compatibility with the factory fuel module make it accessible for DIY mechanics. While the pump alone does not directly add horsepower, it provides the margin of safety needed to unlock the full potential of pulley upgrades, cold air intakes, headers, and aggressive tuning. For Hellcat owners planning to push their car beyond stock power levels, the Stealth 340 is a reliable and cost-effective first step. Combined with a professional tune and supporting modifications, this fuel pump will help you get the most out of your supercharged HEMI.

For more information, refer to the official Aeromotive Stealth 340 product page, a detailed Hellcat.org install thread, or Summit Racing’s listing for pricing and compatibility notes.