Mercedes-AMG C63 Spool FX-350 High Pressure Fuel Pump Kit

The Spool FX-350 high pressure fuel pump kit for the Mercedes-AMG C63 raises the fueling ceiling of the M177 so you can run bigger turbos and higher ethanol blends.

Why you need it

The stock high pressure fuel pump on the M177 runs out of capacity fast once you start tuning. The FX-350 delivers fuel at 35 MPa (350 bar) versus 25 MPa on the FX-200, adds about 90% more flow than stock and lets your injectors flow up to 40% more fuel before they hit the injection window limit. The higher pressure also atomizes fuel better for a more complete burn.

Fits

• Mercedes-AMG C63 / C63 S (M177)

What's included

• 2 x Spool FX-350 upgraded high pressure fuel pumps
• Bosch-spec 10-micron high-flow fuel filter
• Upgraded fuel lines and all install hardware
• Spool wireless ethanol analyzer kit with phone app (if selected)

Spool 10-micron filter

The included filter unit protects the high pressure pumps and injectors from debris without a noticeable pressure drop on the low side.

Good to know

Choose at checkout whether to add the ethanol analyzer, use one you already have, or skip it. The pump needs calibration changes, and they must be applied before the car is started with the pump installed. A custom tune is needed to get the full output. Spool supplies hardware, not tunes, but can share calibration details with your tuner. Adequate low pressure fueling is critical for the pump and injectors, so plan an upgraded low pressure fuel pump into the build. Professional installation is recommended.