Spool - Stage 3 Low Pressure Fuel Pump DIY Kit || F90

Spool Performance BMW S63 Stage 3 Low-Pressure Fuel Pump DIY Kit

Unlock your S63’s full fueling potential with Spool Performance’s Stage 3 Low-Pressure Fuel Pump DIY Kit—an affordable and high-performing solution for enthusiasts pushing big power on E85 or other high-demand fuel setups.

As S63 builds continue to evolve and DI high-pressure pump support improves, the low-pressure electric pumps responsible for feeding them from the tank often become the weak link. This kit eliminates that bottleneck—without breaking the bank.

Key Benefits:

✅ Supports Over 1200whp Low-Side Fueling
✅ Perfect for High-Ethanol Content Fuels (E85)
✅ DIY-Friendly – No need for expensive plug-and-play kits
✅ Boost-Activated Secondary Pump for on-demand flow
✅ Nearly Double the Stock Fuel Flow Capacity

What's Included:

• Dual Pump Bucket Assembly

• Secondary Fuel Pump Activation Harness

• Boost-Activated Pressure Switch

• Boost Reference Adapter

• Complete Hardware Pack

• Step-by-Step Assembly Instructions

Why Choose Spool’s DIY Stage 3 Kit?

Whether you're chasing four-digit horsepower or running ethanol blends, low-pressure fuel starvation can kill performance and reliability. This kit solves that problem by adding a secondary pump that activates under boost — ensuring that your high-pressure pumps are never starved.

• DIY Kit = Major Cost Savings
  Get the performance of high-end plug-and-play systems at a fraction of the price by installing it yourself.

• Boost-On Demand Activation
  The included boost switch activates the second pump only when needed, preserving lifespan and reducing unnecessary wear.

Applications:

• BMW S63 Engines

• M5 F90 / M6 F12-F13 / X5M / X6M

• Ideal for fully built or ethanol-fueled setups

Take control of your fueling. This kit is the perfect solution for serious BMW S63 builds pushing 800–1200+whp.