Spool Performance is excited to introduce our Stage 3 Low-Pressure Fuel Pump DIY Kit for the BMW F90 M5 S63, designed for enthusiasts who prefer a hands-on solution to their fuelling challenges. As high-pressure fuel pumps now support greater Direct Injection (DI) fuelling, the stock low-pressure electric pumps have become a limiting factor when pursuing high horsepower—especially with E85 fuel.

The DIY Kit offers comparable performance to plug-and-play kits at a fraction of the cost. It includes all the components needed to add a secondary boost-activated low-pressure pump, effectively doubling the flow capacity of the stock setup. This ensures more than enough fuelling to support over 1200whp, regardless of fuel type.

Key Features:

• Boost-activated Twin Pump Design: A second pump activates during boost to meet high-demand fueling needs.

• Cost-effective DIY Solution: Delivers the same performance as pre-assembled kits at a reduced cost.

• Supports High Power: Perfect for builds exceeding 1200whp, ideal for E85 applications.

• User-friendly Assembly: Comes with detailed instructions for an easy installation process.

Kit Contents:

1. Secondary Fuel Pump Assembly

2. Secondary Fuel Pump Activation Harness

3. Boost-activated Switch

4. Boost Reference Adapter

5. Hardware Pack