Spool Performance Stage 3 Low Pressure Fuel Pump - DIY Kit [FXX Gen 1 B58] - SP-B58-LPDIY

Looking for an affordable, high-performance fuel solution for your Gen 1 BMW B58 engine? The Spool Performance Stage 3 DIY LPFP Kit delivers all the flow of our premium plug-and-play setup—but at a fraction of the price.

Designed for the budget-conscious enthusiast, this DIY kit includes everything needed to install a secondary, boost-activated Walbro 450 fuel pump, solving low-side fueling issues on even the most aggressive builds running E85 or high boost. Perfect for street and track applications, this kit keeps your B58-powered BMW performing reliably at higher horsepower levels.

Key Features:

• Cost-Effective Fueling Solution: Delivers similar flow rates to the plug-and-play version but at a more affordable DIY price point.
• Secondary Pump Activation: Boost-triggered operation ensures the secondary pump only runs when needed, maintaining factory drivability and fuel system longevity.
• Genuine Walbro 450: Includes a performance-proven Walbro 450 fuel pump pre-modified with two-way quick connect fittings for seamless installation.
• All Hardware Included: Comes with every part needed for installation—clamps, fittings, quick connects, wiring, and optional boost harness.
• Easy Installation: Straightforward assembly instructions make this kit ideal for DIYers with basic mechanical skills.
• Customizable Harness Option: Choose between standard activation or the Hobbs switch harness, which includes a boost-activated switch and adapter for full boost-referenced control.

What’s in the Box:

• 1x Genuine Walbro 450 Fuel Pump (w/ 2-way quick connect fitting)
• 1x Billet Aluminum Pump Holder
• 1x Filter Side Quick Connect Nylon Hose
• 1x Pump Side Quick Connect
• 1x Spare Nylon Hose
• 2x Crimp Clamps
• 2x Screw-On Clamps
• 1x Hardware Pack
• 1x Activation Harness (Select Hobbs Switch Option for Boost Activation)

If Hobbs Switch Harness is selected:

• 1x Boost-Activated Switch
• 1x Boost Reference Adapter

Vehicle Compatibility – Gen 1 B58 (F-Series):

• F30 LCI – 340i / 340i xDrive
• F31 LCI – 340i / 340i xDrive
• F34 GT LCI – 340i / 340i xDrive
• F32 / F32 LCI – 440i / 440i xDrive
• F33 / F33 LCI – 440i / 440i xDrive
• F36 / F36 LCI (Gran Coupé) – 440i / 440i xDrive

Why Choose Spool’s DIY B58 LPFP Kit?

This DIY Stage 3 kit is perfect for B58 owners looking to fix fuel starvation issues without breaking the bank. Whether you're running upgraded turbos, ethanol blends, or pushing for more power, Spool Performance gives you the control and fueling you need to go further—without compromise.

Note: 'New' merchandise may be returned for exchange or refund within 15 days from the date of shipment. 'New' merchandise must be unused and free from installation or mounting damage. Installation or modification of parts waives your right to returns, refunds, or exchanges.

The standard shipping rate applies to orders within the continental United States. If you intend to place an order outside of the continental US, please reach out to support@x-ph.com for assistance.