Spool FX-350 HPFP Kit | AMG M133
The Spool Performance FX-350 is the next-generation High-Pressure Fuel Pump (HPFP) upgrade for Mercedes-AMG M133 engines. This model surpasses the previous FX-200 version in performance and efficiency, offering significantly higher pressure and better fuel utilization in high-power configurations.
What is the FX-350?
The FX-350 is an advanced HPFP designed to operate at significantly higher pressures than previous solutions.
- 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 reached
- Full E85 compatibility
- Plug & Play installation
Benefits of higher pressure:
- Improved fuel atomization
- More efficient and cleaner combustion
- Increased power and better efficiency
Why is an upgrade necessary?
The M133 engine's stock HPFP is a significant limitation for tuning:
- Insufficient fuel capacity for high power levels
- Limited use of ethanol blends
FX-350:
- Elevates the fuel system capacity to a new level
- Enables larger turbochargers
- Supports demanding tuning configurations
Package contents
- 1 x FX-350 high-pressure fuel pump
- Updated fuel lines + installation hardware
- Bosch 10-micron high-flow fuel filter
- Ethanol content monitoring system (optional, with mobile app)
Spool 10-micron filter
- Excellent filtration efficiency without pressure drop
- Protects the pump and injectors from contaminants
- Optimized for the Mercedes platform
Spool Ethanol Content Monitor (optional)
- Real-time ethanol content and fuel temperature monitoring
- BLE 4.0 connectivity to a mobile application
- Allows for precise mixture ratio control
- PTFE-cored, stainless steel braided E85-compatible fuel lines
Software Requirements
- Requires software modifications before commissioning
- Calibration is essential for safe and optimal operation
Spool:
- Provides the necessary information 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 is based on fuel flow
- Lack of fuel can lead to wear and failure
Recommendation: ensure adequate low-pressure side upgrade