Spool FX-350 HPFP Kit | AMG GT / GTS / GTC / GTR (M178)
The Spool Performance FX-350 is the next generation high-pressure fuel pump (HPFP) upgrade for Mercedes-AMG M178 engines. This solution surpasses the previous FX-200 model in both pressure and overall performance, providing significantly improved fuel delivery for high-power applications.
What is the FX-350?
The FX-350 is designed to operate at significantly higher pressure than its predecessor, directly increasing fuel flow through the injectors.
- Operating pressure up to 35 MPa / 350 bar
- Up to +90% more flow compared to stock
- Approximately +40% more fuel through 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
- Allows for higher power without additional injection
Why is an upgrade necessary?
The M178 engine's stock HPFP significantly limits tuning potential:
- Fuel capacity is insufficient for high power levels
- Use of ethanol blends is limited
The FX-350:
- Elevates the fuel system capacity to a new level
- Allows for larger turbochargers
- Supports more aggressive tuning configurations
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 efficiency without pressure drop
- Protects pumps and injectors from contaminants
- Designed for the Mercedes platform
Spool Ethanol Content Monitor (optional)
- Real-time ethanol content and fuel temperature monitoring
- BLE 4.0 connection to mobile app
- Allows for precise mixture ratio control
- PTFE-lined, braided stainless steel E85-compatible fuel lines
Software requirements
- Requires software modifications before commissioning
- Calibration is essential for safe and optimal operation
Spool:
- Provides necessary calibration data to the tuner
- Helps find 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