Spool FX-350 HPFP Kit | AMG M276
The Spool Performance FX-350 is a high-performance high-pressure fuel pump (HPFP) upgrade for Mercedes-Benz M276 engines. This model represents the next evolutionary step from the FX-200, offering significantly higher operating pressure and clearly improved fuel capacity for demanding tuning setups.
What is the FX-350?
The FX-350 is an advanced HPFP designed to produce significantly more pressure and flow than previous models.
- Operating pressure up to 35 MPa / 350 bar
- Up to +90% more flow compared to stock
- Approx. +40% more fuel through the injectors before reaching injection limits
- 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 M276 engine's stock HPFP is a significant limitation for tuning:
- Insufficient fuel delivery for high power levels
- Limited use of ethanol blends
The FX-350:
- Elevates the fuel system capacity to a new level
- Allows for larger turbochargers
- Supports demanding performance configurations
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 application
Spool 10-micron filter
- Top-tier filtration without significant pressure drop
- Protects pump and injectors from contaminants
- Optimized for the M276 platform
Spool Ethanol Content Monitor
- Real-time ethanol content and fuel temperature monitoring
- BLE 4.0 connection to mobile application
- Enables precise fuel mixture control
- PTFE core, stainless steel braided E85-compatible fuel lines
Software Requirements
- Requires software modifications before commissioning
- Calibration must be performed before using the pump
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 consideration: LPFP
The low-pressure fuel system is critical:
- Insufficient supply can damage 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