Spool Performance FX-350 Upgraded High Pressure Fuel Pump System | [M157]

Upgrade the fueling capacity of your Mercedes-AMG M157 5.5L V8 biturbo engine with the Spool FX-350 High-Pressure Fuel Pump System. Designed for high-horsepower applications, the FX-350 provides increased fuel flow and pressure capabilities to support upgraded turbochargers, higher ethanol concentrations, and aggressive performance builds.

With operating pressure capabilities of up to 350 BAR, the FX-350 offers additional high-pressure fuel delivery capacity beyond the factory system. It is designed to support demanding fueling requirements while maintaining factory-style integration.

Key Features

• Designed specifically for the Mercedes-AMG M157 5.5L V8 biturbo engine

• Supports operating pressures of up to 350 BAR

• Increased high-pressure fuel delivery capacity

• Designed to support high-horsepower applications

• Provides additional fueling capacity for E50, E85, and other ethanol blends

• Supports upgraded turbocharger configurations

• Helps overcome factory high-pressure fuel system limitations

• Requires custom ECU tuning and fuel system calibration

Kit Includes

• 2 × Spool FX-350 upgraded high-pressure fuel pumps

• Upgraded fuel lines and necessary installation hardware

• Additional supporting fuel system components, depending on the selected package configuration

350 BAR High-Pressure Fuel Technology

The FX-350 supports fuel pressures of up to 350 BAR, providing additional flexibility for direct-injection fueling strategies. This increased pressure capability, combined with higher pump flow capacity, gives tuners more flexibility when optimizing injection pressure, injector delivery, and injection timing for a specific engine setup.

E85 and Ethanol Fuel Compatibility

The FX-350 is designed to support ethanol-based fueling applications, including E50 and E85. Because ethanol blends require more fuel volume than conventional pump gasoline, increased high-pressure fuel delivery capacity can be important for higher-output applications.

Custom Tuning Requirements

Custom ECU tuning and fuel system calibration are required before starting the engine with the upgraded pumps installed.

The ECU must be calibrated to account for the upgraded pump characteristics and increased fuel delivery capabilities. Operating the vehicle without the appropriate calibration can result in improper fuel system operation and potential component damage.

Spool Performance can provide pump calibration information to your existing tuner and assist with technical integration questions. Spool Performance specializes in fuel system hardware and does not provide custom ECU tuning.

Supporting Low-Pressure Fuel System Upgrades

A sufficient low-pressure fuel supply is essential for proper high-pressure fuel pump operation, lubrication, and long-term durability. An inadequate supply can cause fuel starvation, excessive pump wear, and damage to internal pump components.

Evaluate the factory low-pressure fuel system and upgrade supporting components when necessary to maintain adequate fuel supply under demanding operating conditions.

Fitment

• Mercedes-AMG M157 5.5L V8 biturbo engine applications

Important: Verify vehicle and engine compatibility, package configuration, supporting fuel system requirements, and tuning needs before purchase.

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.