Spool Stage 3 DIY LPFP BMW [B58 Gen.1]

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Spool Stage 3 DIY LPFP | BMW B58 Gen.1

The Spool Performance Stage 3 DIY LPFP is a Low-Pressure Fuel Pump (LPFP) upgrade kit for BMW B58 Gen1 engines. This solution is aimed at users who want to build a powerful and cost-effective DIY solution to remove fuel system limitations.

Product Description

The Stage 3 DIY kit offers almost the same flow capacity as ready-made plug & play solutions, but at a significantly lower price. The kit allows for the addition of a secondary, boost-activated fuel pump to the system.

• Flow capacity close to plug & play solutions
• Significantly more affordable DIY option
• Removes the low-pressure side bottleneck
• Designed for high-power setups

Operating Principle

• Secondary pump activates according to boost pressure
• Increases fuel supply as load increases
• Ensures sufficient supply to the HPFP system

Why is an upgrade necessary?

The standard LPFP of the B58 Gen1 engine can limit performance:

• High power and ethanol blends require more fuel
• Insufficient supply impairs HPFP operation

Stage 3 LPFP:

• Significantly improves fuel system capacity
• Enables high power safely
• Reduces fuel system limitations

Installation

• DIY solution (self-assembly)
• Clear instructions included
• Not fully plug & play

Package Contents

• Walbro 450 fuel pump (modified with quick connector)
• Billet aluminum pump bracket
• Nylon quick-connect hoses (filter and pump side)
• Spare nylon hose
• Clamps (crimp + screw clamps)
• Activation wiring harness
• Boost-controlled switch
• Boost reference adapter
• Installation hardware kit

Compatibility

BMW models with B58 Gen1 engine, including:

• F30 / F31 / F34 340i / 340iX (LCI)
• F32 / F33 / F36 440i / 440iX (LCI models also)