Spool FX-350 Upgraded High Pressure Fuel Pump System | GLS63 AMG [M177]
Spool FX-350 Upgraded High Pressure Fuel Pump System | GLS63 AMG [M177] is a high-pressure fuel-pump upgrade that increases high-pressure direct-injection fuel capacity for tuned engines and ethanol-blend applications. It is intended for performance-focused builds where the fuel system, airflow or drivetrain must support demands beyond the factory configuration.
The product is supplied as an application-specific Spool configuration. Check the engine version, body style and selected package contents before ordering. Correct sizing and professional installation are particularly important for fuel-system and engine-management changes.
Technical details
- System pressure up to 350 bar according to the manufacturer
- System pressure up to 250 bar according to the manufacturer
- Approximately 90% more flow according to the manufacturer
- E85-compatible construction
- Requires ECU calibration before start-up
- Manufacturer SKU or variant code depends on the selected configuration
Available options
- Add Spool ethanol sensor, Vehicle has Spool ethanol sensor, No ethanol sensor
An upgraded high-pressure pump requires the product-specific ECU calibration changes before the engine is started. Make sure the low-pressure fuel system can also support the selected power level.




