BMW F90 M5 S63 Spool Stage 3 Low Pressure Fuel Pump Kit

The Spool Stage 3 low pressure fuel pump kit for the BMW F90 M5 adds a boost-activated second pump to remove the low side as a bottleneck on high-horsepower S63 builds.

Why you need it

With upgraded high pressure pumps supporting more direct injection fueling, the stock in-tank pumps become the limit, especially on E85. This twin-pump setup brings the secondary pump in at boost onset, doubling flow over stock and supporting over 1200 whp of low pressure fueling on any fuel.

Fits

• BMW M5 (F90, S63)

Features

• Boost-activated twin-pump design
• Double the flow of the stock setup
• Supports 1200+ whp on E85 or gasoline

What's included

• Dual pump bucket assembly
• Secondary fuel pump
• Activation harness (your choice)
• Boost-activated switch
• Boost reference adapter
• Hardware pack

Good to know

Choose the activation harness that matches your setup: ground activation with a Reflex flying lead, ground and power activation for a Reflex plug and play or Rev2 BM3 setup, or the Spool Hobbs switch. Pair with upgraded high pressure fueling and a matching tune for best results. Professional installation is recommended.