Hellcat Fuel Pump Upgrade: The Complete Guide to Choosing the Right Fuel System for Your High-Performance Build

Upgrading your Hellcat fuel pump is essential the moment your modifications push past 800-825 crankshaft horsepower. Without a proper fuel system upgrade, your engine will suffer from fuel starvation under boost, leading to lean conditions, misfires, and potentially catastrophic engine damage. The stock Hellcat fuel pump simply cannot keep up with the demands of modified supercharged engines, especially when you add a pulley upgrade, tune, or switch to E85 fuel. The good news is that there are multiple proven fuel system options available, ranging from simple voltage boosters to complete dual and triple pump kits, each designed to support specific horsepower levels and fuel types.

When Do You Need a Hellcat Fuel Pump Upgrade?

The Hellcat’s 6.2L supercharged engine demands a massive amount of fuel at wide open throttle. The factory single pump system reaches its limit at around 725 to 750 rear-wheel horsepower (RWHP). If you are planning any performance modifications that will exceed this threshold, you need a fuel system upgrade. Common signs that your stock fuel system is struggling include:

  • Power loss at high RPM – The engine feels like it is running out of steam as you approach redline.
  • Fuel pressure drop under boost – Your fuel pressure gauge shows a significant drop when the supercharger builds boost.
  • Hesitation during hard acceleration – The engine stumbles or cuts out when you stomp on the throttle.
  • Misfires at full throttle – Lean fuel mixtures cause the engine to misfire under load.
  • Plans to run E85 – Ethanol requires approximately 30% more fuel volume than gasoline to achieve the same air-fuel ratio.

Understanding Your Options: Voltage Boosters vs. Complete Fuel Systems

Before you pick a fuel system, you need to understand the two main approaches to upgrading fuel delivery on the Hellcat.

Fuel Pump Voltage Boosters

A fuel pump voltage booster is the simplest and most cost-effective way to increase fuel flow. Units like the JMS FuelMAX V2 and Fuelmax boost the voltage supplied to your stock fuel pump from the standard 14.4 volts up to 22 volts, which can increase fuel pump output by up to 85 percent.

The JMS FuelMAX V2 is a plug-and-play solution that supports up to 1000 horsepower with a single pump and 1350 horsepower with dual pumps. It features an adjustable Hobbs switch (preset at 5 psi, adjustable from 3 to 7 psi) and adjustable voltage ramp-in and ramp-out to eliminate fuel pressure spikes. Installation is straightforward: you simply splice the FuelMAX into your existing fuel pump’s +12V DC feed wire.

Pros: Low cost, easy installation, retains the factory fuel system.
Cons: Limited capacity, may not be sufficient for high-horsepower builds or E85.

Complete Dual and Triple Pump Fuel Systems

When you need more fuel than a voltage booster can provide, you must upgrade to a complete fuel pump system that replaces the factory pump with higher-flow units. These systems come in two main configurations: returnless and return-style.

Returnless systems keep the factory-style fuel system architecture, which uses the PCM to control fuel pressure via pulse-width modulation (PWM). This is important because the Hellcat’s PCM continuously monitors the fuel rail pressure and adjusts the pump speed to maintain the commanded pressure. Systems that eliminate the PWM controller and run the pumps on raw voltage remove a key control element, which can degrade drivability and, in extreme cases, damage the engine.

Return-style systems use a fuel pressure regulator and return line to send excess fuel back to the tank. While these systems can support very high horsepower, they often eliminate the factory surge tank and PWM control, which can cause issues with fuel pump cooling and drivability.

Top Hellcat Fuel Pump Upgrade Options

1. HHP Racing Plug & Play Dual Walbro 525LPH Returnless Fuel System

This is one of the most popular and proven Hellcat fuel system upgrades on the market. The HHP Racing kit uses dual Walbro 525LPH F90000285 fuel pumps and a Fore Innovations fuel hat assembly modified for returnless operation. It includes a complete plug-and-play wiring harness, fuses, relays, and a fuel pump variable pressure controller.

Horsepower Ratings:

  • 1600+ BHP / 1300+ RWHP on gasoline (pump and race fuels)
  • 1100+ BHP / 900+ RWHP on ethanol fuels (E85, C85, E98, Ignite, etc.)

This kit has been track-proven on low 9-second and 8-second Hellcats since early 2016. Installation time is approximately 3 hours.

2. Livernois Motorsports Dual Fuel Pump Kit (LPP501130)

Livernois Motorsports pioneered the Flex Fuel upgrade for the 2015-2021 Hellcat and designed this dual pump kit to keep the factory-style returnless fuel system intact. The kit features a billet hard-anodized fuel hat and pump hanger system, two 500+ LPH E85-rated fuel pumps, and a secondary fuel pump control module.

Capability:

  • Up to 1300 RWHP on gasoline
  • Up to 1000 RWHP on E85 with proper voltage supply

This system is designed for reliability and simplicity. It is not a plug-and-play solution but requires only simple wiring.

3. MMX Dual Pump Fuel System (by Modern Muscle Xtreme)

The MMX system uses dual Ti Automotive F90000285 turbine pumps and is completely E85 compatible. It integrates seamlessly with the stock fuel system and controller, including a plug-and-play wiring harness and PWM controller.

Dyno Proven:

  • Over 1100 RWHP on E85
  • 1200+ RWHP on gasoline

A key feature of this system is its proprietary surge tank with 35% greater capacity than the OEM unit, plus dual high-volume jet pumps. This ensures the pumps never run dry, even under extreme conditions. Installation typically takes less than two hours.

4. Impulse Tuning 285LPH Dual Fuel Pump System

This system is designed to maintain the OEM fuel management system and surge tank. It uses the stock fuel basket, which Impulse Tuning argues is fully capable of keeping up with dual pumps (the Demon and Redeye use the same capacity surge tank with their factory dual pump systems).

Capability: Supports up to 1100+ RWHP.

5. Fore Innovations Complete Fuel Systems

Fore Innovations offers a full range of dual and triple pump systems for the Hellcat platform. They offer different line routing configurations (L2, L3, and L4) to suit different installation preferences.

  • L2: Feed enters fuel rails in horseshoe pattern with regulator at the end (most popular)
  • L3: Feed enters regulator then disburses to individual rails (least popular)
  • L4: Feed is split by a Y-Block and enters both rails in parallel

Their dual pump systems support 1200 RWHP, while triple pump kits are capable of supporting 1600 HP on gasoline or more.

6. Fuel Injection Depot Plug and Play Dual Returnless System

This system is designed specifically for 2015-2023 Hellcat Challenger and Charger models (not compatible with Redeye, Demon, or Super Stock). It includes two Walbro 525 LPH pumps, a Fuel Pump Driver Module (FPDM), and a complete plug-and-play wiring harness.

Performance:

  • Up to 900 wheel horsepower on ethanol
  • Up to 1300 wheel horsepower on gas

What About the Redeye and Demon?

The Dodge Redeye and Demon come from the factory with a dual pump system. While these are more capable than the standard Hellcat single pump, they still have limits. For most Redeye owners, a Fore Innovations triple pump kit is the recommended upgrade when pushing beyond stock power levels.

Installation Tips and Considerations

Most Hellcat fuel pump upgrades are designed as drop-in replacements that install directly into the OEM fuel tank. However, there are a few important things to keep in mind:

Fuel tank removal is required. You will need to drop the fuel tank to access the pump assembly. This is the most time-consuming part of the installation.

Wiring upgrades are often necessary. Many dual pump systems require upgraded wiring to handle the increased current draw. Make sure your kit includes a proper wiring harness and controller.

Tuning is essential. After installing a fuel system upgrade, you must have your vehicle tuned to match the new fuel delivery with your injector size and engine demand. This ensures proper air-fuel ratios and safe operation.

E85 compatibility is not automatic. If you plan to run E85, make sure your fuel system components are rated for ethanol use. Ethanol can be corrosive to some pump materials, so look for pumps with ethanol-compatible internals.

KEMSO Fuel Pump: The Smart Choice for Reliability and Performance

When it comes to high-performance fuel pumps that deliver exceptional value and reliability, KEMSO stands out as a trusted brand. KEMSO fuel pumps are designed as direct OEM replacements, offering over 20% more flow at 43 psi compared to stock pumps. This means you get genuine performance gains without the complexity of aftermarket modifications.

Every KEMSO fuel pump is individually tested for flow and performance before it leaves the factory, ensuring you receive a product that works right out of the box. The pumps are built to handle both gasoline and ethanol-blended fuels like E85, using materials that resist ethanol degradation for long-term reliability.

What sets KEMSO apart is their lifetime warranty. KEMSO stands behind their products for as long as you own your vehicle. This is a level of protection that most OEM pumps do not offer, and it gives you complete peace of mind.

KEMSO fuel pumps are available for a wide range of vehicles, from motorcycles and ATVs to cars and personal watercraft. Whether you need a replacement for your daily driver or a performance upgrade for your track build, KEMSO has the right fuel pump for your needs. All pumps are priced competitively at $79.98, offering exceptional value for a lifetime-guaranteed part.

To find the perfect fuel pump for your vehicle, visit KEMSO’s official website at: https://www.kemsoracing.com/. Their team provides detailed product information, installation guides, and customer support to help you choose the right solution for your specific vehicle. With a lifetime warranty and a commitment to quality, KEMSO is the smart choice for any engine owner.

Final Thoughts: Choosing the Right Fuel System for Your Hellcat

Selecting the right Hellcat fuel pump upgrade comes down to your horsepower goals, fuel type, and budget. Here is a quick summary to help you decide:

  • If you are under 1000 HP and want a simple, affordable solution: A fuel pump voltage booster like the JMS FuelMAX V2 is a great starting point. It can support up to 1000 HP with a single pump and is easy to install.
  • If you are targeting 1000-1300 HP on gasoline: A dual pump returnless system from HHP Racing, Livernois Motorsports, or MMX will provide the fuel flow you need while maintaining the factory PCM control for excellent drivability.
  • If you are running E85 and want 900+ RWHP: Make sure you choose a system that is specifically rated for ethanol, such as the HHP Racing dual pump system or the MMX system. E85 requires significantly more fuel volume.
  • If you are building a 1300+ HP race car: A triple pump system from Fore Innovations is the most capable option, supporting up to 1600 HP on gasoline.
  • If you need a reliable replacement or upgrade for any vehicle: KEMSO fuel pumps offer high performance, OEM compatibility, and a lifetime warranty at an affordable price. Visit https://www.kemsoracing.com/ to find the right pump for your ride.

No matter which route you choose, remember that a proper fuel system is the foundation of any high-performance build. Do not cut corners on fuel delivery, or you risk damaging your engine. Invest in a quality system, get it professionally tuned, and enjoy the full potential of your Hellcat.


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