Spool Performance FX-350 Upgraded High Pressure Fuel Pump System | SL63 AMG [M177]

Maximize your Mercedes-AMG SL63 M177's fueling potential with the FX-350 High Pressure Fuel Pump Upgrade from Spool Performance. Designed to meet the demands of high-horsepower builds and ethanol-blended fuels, the FX-350 is the next-generation solution, delivering up to 90% more flow than the factory pump. With significantly higher pressure capabilities and improved atomization, this system is engineered for enthusiasts chasing performance without compromise.

What is the FX-350?

The Spool Performance FX-350 is the successor to the popular FX-200, offering a major leap in flow rate, fuel pressure, and combustion efficiency. By raising fuel pressure from 25MPa to 35MPa, the FX-350 enhances injector output by up to 40%, thanks to the physics principle Q = P × A, where increased pressure (P) directly boosts fuel flow (Q). The result is more power, better atomization, cleaner combustion, and the fueling headroom needed to support larger turbos and higher ethanol blends.

Key Features:

• 35MPa Fuel Pressure
  Delivers significantly higher pressure compared to stock and FX-200 pumps, allowing for greater injector output and better atomization.

• +90% Flow Over Stock HPFPs
  Unleash the full potential of your M177 with nearly double the flow, allowing for aggressive tuning and increased ethanol content support.

• Improved Combustion Efficiency
  Higher pressure improves fuel atomization, which leads to a cleaner, more complete burn—maximizing power while improving fuel economy and emissions.

• Essential for E85 Builds and Big Turbo Setups
  Supports high-horsepower setups and ethanol blends without risking fuel starvation or internal component damage.

Kit Includes:

• 2x FX-350 High-Pressure Fuel Pumps

• 1x Bosch-spec 10-Micron High-Flow Fuel Filter

• Upgraded E85-Compatible PTFE Fuel Lines

• All Required Installation Hardware

• Optional Spool Ethanol Content Monitor (ECA) Kit with BLE 4.0 wireless connection and mobile app integration

Spool 10-Micron Filter Unit

Protects your fuel system and injectors with the finest filtration available on the Mercedes market, all while ensuring zero pressure drop in the low-pressure fuel circuit. This premium filter is highly recommended for optimal pump and injector longevity.

Spool Ethanol Content Analyzer (ECA) Kit

Monitor your in-tank ethanol content and fuel temperature in real-time using Spool’s BLE 4.0 wireless technology. Seamlessly connect with your mobile device while retaining Bluetooth functionality for other devices.

Tuning Requirements

Tune calibration is required for proper function and safety. Spool Performance does not provide custom tunes, but will supply calibration data to your existing tuner or help connect you with experienced tuners. Do not operate the vehicle without calibration to avoid damage and warranty void.

Low-Pressure Fuel Pump Compatibility

For best results, pair with a proper low-pressure fuel pump upgrade, especially when running ethanol blends or pushing beyond factory output. Insufficient low-side fueling can damage the FX-350's internal components and void the warranty. Plan your fuel system accordingly.

Engineered for Performance and Reliability

The Spool FX-350 HPFP System is the ultimate fuel system upgrade for the Mercedes-AMG SL63 (M177), built for drivers demanding more power, more reliability, and full E85 support. Whether you're running big turbos, ethanol mixes, or chasing maximum horsepower, the FX-350 is your fueling solution.

Note: 'New' merchandise may be returned for exchange or refund within 15 days from the date of shipment. 'New' merchandise must be unused and free from installation or mounting damage. Installation or modification of parts waives your right to returns, refunds, or exchanges.