Spool FX-350 HPFP Kit | AMG M177
The Spool Performance FX-350 is the next-generation high-pressure fuel pump (HPFP) upgrade for Mercedes-AMG M177 engines. This model surpasses the previous FX-200 in performance and efficiency, offering significantly higher pressure and better fuel utilization for high-power applications.
What is the FX-350?
The FX-350 is an advanced HPFP designed to operate at significantly higher pressures than traditional solutions.
- Operating pressure up to 35 MPa / 350 bar
- Up to +90% more flow compared to stock
- Full E85 compatibility
- Plug & Play installation without modifications
Effects of higher pressure:
- Up to approx. 40% more fuel through the injectors before reaching injection limits
- Improved fuel atomization
- More efficient combustion and better efficiency
- Enables higher power and better response
Why is an upgrade necessary?
The M177 engine's stock HPFP limits performance during tuning:
- Insufficient fuel capacity for high power levels
- Ethanol blends remain limited
The FX-350:
- Significantly increases fuel system capacity
- Enables larger turbos and more aggressive tunes
- Greatly expands the platform's performance potential
Package contents
- 2 x FX-350 high-pressure fuel pumps
- Upgraded 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 performance without significant 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 display
- BLE 4.0 connection to mobile app
- Enables precise mixture ratio control
- PTFE-lined, braided stainless steel E85-compatible fuel lines
Software requirements
- Requires software modifications before commissioning
- Calibration is essential for performance and safety
Spool:
- Provides the necessary 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 is based on fuel flow
- Lack of fuel can lead to wear and failure
Recommendation: ensure adequate low-pressure side upgrade