Spool FX-350 HPFP Kit | AMG M256
The Spool Performance FX-350 is the next generation high-pressure fuel pump (HPFP) upgrade for Mercedes-Benz M256 engines. This solution surpasses the previous FX-200 model in performance and efficiency, offering significantly higher operating pressure and improved fuel utilization in demanding tuning configurations.
What is the FX-350?
The FX-350 is an advanced HPFP designed to deliver significantly higher pressure and flow than stock or previous upgrade pumps.
- Operating pressure up to 35 MPa / 350 bar
- Up to +90% more flow compared to stock
- Approximately +40% more fuel through the injectors before injection limits are met
- Full E85 compatibility
- Plug & Play installation without modifications
Benefits of higher pressure:
- Improved fuel atomization
- More efficient and cleaner combustion
- Better efficiency and greater power potential
Why is an upgrade necessary?
The M256 engine's stock HPFP is a significant limitation in tuning:
- Insufficient fuel capacity for high power levels
- Limited use of ethanol blends
The FX-350:
- Significantly increases fuel system capacity
- Allows for larger turbochargers and more powerful configurations
- Expands the platform's performance potential
Package contents
- 1 x FX-350 High Pressure Fuel Pump
- Upgraded fuel lines + installation hardware
- Bosch 10 micron high flow fuel filter
- Ethanol content monitoring system with mobile app
Spool 10-micron filter
- High-level filtration without significant pressure drop
- Protects the pump and injectors from contaminants
- Optimized for Mercedes platforms
Spool Ethanol Content Monitor
- Real-time ethanol content and fuel temperature monitoring
- BLE 4.0 connectivity to mobile app
- Enables precise fuel mixture control
- PTFE core, braided stainless steel E85-compatible fuel lines
Software Requirements
- Requires software changes before commissioning
- Calibration is essential for safe and optimal operation
Spool:
- Provides necessary calibration data to the tuner
- Assists in finding an experienced tuner if needed
Note: Spool does not offer ready-made custom tunes
Important note: LPFP
The low-pressure fuel system is critical:
- Insufficient supply can cause damage to the pump and injectors
- HPFP lubrication relies on fuel flow
- Lack of fuel can lead to wear and failure
Recommendation: ensure adequate low-pressure side upgrade