Mercedes-Benz 550 M278 Spool Stage 3 Low Pressure Fuel Pump Upgrade

The Spool Stage 3 low pressure fuel pump kit for the Mercedes-Benz 550 M278 removes the in-tank pump as a bottleneck on high-horsepower M278 builds, especially on E85.

Why you need it

Once your high pressure pumps can support the fuel demand, the factory in-tank pumps that feed them become the limit. This twin-pump design brings the second pump in at boost onset, giving almost double the flow of a stock pump and supports over 1200 whp of low pressure fueling on any fuel type.

Fits

• Mercedes-Benz E550 (M278)
• Mercedes-Benz CLS550 (M278)
• Mercedes-Benz S550 (M278)

Features

• Twin-pump design with the second pump activating at boost onset
• Supports over 1200 whp of low pressure fueling
• Built for high ethanol blends including E85

Good to know

Pair with an upgraded high pressure fuel pump and a matching tune for best results. Professional installation is recommended.