Spool Performance Stage 3 Low Pressure Fuel Pump - DIY LPFP Kit [G30 540i B58]

Upgrade your BMW B58 fuel system with the Spool Stage 3 Low Pressure Fuel Pump (LPFP) DIY Kit, a true plug-and-play Stage 3 LPFP solution designed for G-chassis BMW applications. Engineered for high-performance builds, this auxiliary fuel pump kit provides an upgraded low-pressure fuel delivery solution for customers looking to support increased fueling demands.

The Spool Stage 3 LPFP Kit features a proprietary three-piece mounting bracket system that locks directly into the factory fuel tank assembly, eliminating the need to drill or cut the factory fuel bucket. Designed for straightforward installation, the kit uses the supplied fuel hoses and fittings to connect to the factory fuel line, making it a practical DIY-friendly fuel system upgrade.

Vehicle-specific mounting brackets are selected according to your BMW's fuel tank design. Please provide your vehicle's year, make, model, or VIN when ordering so the correct mounting bracket can be determined. BMW uses different fuel tank designs across the G-chassis lineup, so the bracket shown in the product images may not be the exact bracket you receive. Functionality, fitment, and performance will remain the same.

Whether you are building a street car, drag racing setup, or high-performance BMW, the Spool Stage 3 LPFP Kit offers multiple fuel pump, wiring harness, and optional upgrade configurations to accommodate different fueling requirements.

Why Choose the Spool Stage 3 LPFP Kit?

Unlike other LPFP kits on the market, the Spool Stage 3 design requires no drilling or cutting of the factory fuel bucket.

The pump is secured using Spool's proprietary three-piece bracket system, which locks directly into the factory fuel tank assembly for a true drop-in installation.

The supplied fuel hoses connect to the factory fuel line using the included fittings and hoses. This design simplifies installation and eliminates the need to modify the fuel bucket.

For customers who prefer not to drill the factory fuel pump top hat for the power wiring, Spool also offers a pre-drilled OEM top hat as an optional upgrade for $50.

Please contact Spool sales for this option or add the request to your order notes.

Key Features

• Brand: Spool Performance

• Product: Stage 3 Low Pressure Fuel Pump (LPFP)

• Product Type: DIY LPFP Kit

• Vehicle Platform: BMW G-chassis

• Engine Application: BMW B58

• Featured Vehicle: BMW G30 540i

• Installation Type: Plug-and-play auxiliary fuel pump installation

• Mounting System: Proprietary three-piece bracket system

• Fuel Bucket Modification: No drilling or cutting required

• Fuel Line Connection: Supplied fuel hoses and fittings

• Fuel Pump Options: Walbro 450 and Walbro 525

• Harness Options: Spool Hobbs Switch Harness, Reflex Plug-and-Play Harness, Reflex Flying Lead / Ground Trigger / Universal Harness

• Optional Upgrade: Pre-drilled OEM fuel pump top hat for $50

• Optional Upgrade: Holley Hydramat for $200

Fuel Pump Options

Walbro 450

The Walbro 450 is recommended for the vast majority of applications.

It provides more than enough fuel for most street, drag racing, and high-performance builds while maintaining excellent reliability.

This fuel pump is the recommended option for customers looking for an upgraded LPFP solution for typical performance applications.

Walbro 525

The Walbro 525 is recommended for customers with higher horsepower goals requiring additional fuel flow.

Due to its higher current draw, Spool strongly recommends pairing the Walbro 525 with the PWM harness.

Running the standard relay harness with a Walbro 525, particularly in hot climates, can overload and prematurely damage the relay.

For high-current applications, selecting the appropriate harness is important to help prevent relay overload and premature component damage.

Harness Options

Spool offers three harness options to accommodate different fuel system configurations, wiring preferences, and auxiliary pump activation requirements.

Spool Hobbs Switch Harness

The Spool Hobbs Switch Harness uses the included 10 PSI Hobbs pressure switch to activate the secondary fuel pump under boost.

The Hobbs switch can be connected using either of the following methods:

• Tapping into the charge pipe.

• Using the optional fitting to tee into the intake manifold.

The harness connects directly to the battery for power and ground, then routes to the fuel pump and continues into the engine bay to connect to the Hobbs switch.

This harness is the ideal solution for customers who are not using a Reflex controller.

Reflex Plug-and-Play Harness (May Also Work with Rev2)

The Reflex Plug-and-Play Harness is designed for Reflex-controlled applications that require both power and ground to activate the auxiliary fuel pump.

Depending on your existing Reflex harness, you may need to depin the connector and swap the power and ground wires.

This is a simple procedure that any knowledgeable performance shop can perform.

The harness routes from the battery to the fuel pump and then connects directly to Auxiliary Output 2 on your aftermarket Reflex harness.

This option is intended for customers using a compatible Reflex setup and requiring a direct auxiliary pump connection.

Reflex Flying Lead / Ground Trigger / Universal Harness

The Reflex Flying Lead / Ground Trigger / Universal Harness is Spool's most popular harness option.

It is designed for customers using the standard Motiv Reflex main harness.

The harness is activated through a ground trigger using Auxiliary Output 2.

To install, simply strip the gray Aux 2 wire, connect it using the supplied butt connector, and plug the connector into the harness.

This eliminates the need to source terminals or build your own connector, reducing installation time and preventing common wiring issues caused by improperly pinned connectors.

This harness provides a straightforward solution for customers using the standard Motiv Reflex main harness and requiring ground-triggered auxiliary pump activation.

Optional Pre-Drilled OEM Fuel Pump Top Hat

For customers who prefer not to drill their factory fuel pump top hat for the power wiring, Spool offers a pre-drilled OEM top hat as an optional upgrade for $50.

This option is intended for customers who want to avoid drilling the factory top hat themselves.

To request this upgrade, contact Spool sales or add the request to your order notes.

The pre-drilled OEM top hat is optional and is not included as a standard component of the kit unless selected.

Optional Holley Hydramat

For customers concerned about fuel starvation during hard cornering or when running low fuel levels, Spool offers an optional Holley Hydramat upgrade for $200.

The Hydramat is intended for customers seeking additional fuel pickup support under demanding driving conditions.

This upgrade is optional and can be selected according to your vehicle's fuel system requirements and driving conditions.

Installation Information

The Spool Stage 3 LPFP Kit is designed for a drop-in installation using the proprietary three-piece bracket system.

The mounting bracket locks directly into the factory fuel tank assembly without requiring drilling or cutting of the fuel bucket.

The supplied fuel hoses connect to the factory fuel line using the included fittings and hoses.

Installation requirements vary depending on the selected harness and fuel pump configuration.

The Spool Hobbs Switch Harness uses the included 10 PSI Hobbs pressure switch.

The Reflex Plug-and-Play Harness connects to Auxiliary Output 2 on the aftermarket Reflex harness and may require power and ground wire changes depending on the existing harness configuration.

The Reflex Flying Lead / Ground Trigger / Universal Harness connects to the gray Aux 2 wire using the supplied butt connector and activates through a ground trigger.

For the Walbro 525, Spool strongly recommends the PWM harness due to the pump's higher current draw.

Professional installation is recommended for customers unfamiliar with fuel system modifications, electrical wiring, or auxiliary pump integration.

Vehicle Fitment

Vehicle Make: BMW

Vehicle Platform: G-chassis

Featured Vehicle: BMW G30 540i

Engine: B58

Compatible Applications: G-chassis BMW models

Product: Spool Stage 3 Low Pressure Fuel Pump (LPFP) DIY Kit

Fuel System: Low-pressure fuel pump / auxiliary fuel pump

Fitment Note: This kit is compatible with G-chassis BMW applications. BMW uses different fuel tank designs across the G-chassis lineup, so the correct mounting bracket must be determined according to the vehicle's fuel tank configuration.

Please provide your vehicle's year, make, model, or VIN when ordering so Spool can determine the correct mounting bracket.

The bracket shown in the product images may not be the exact bracket supplied for your vehicle. Functionality, fitment, and performance will remain the same.

Important: Confirm your vehicle's exact application and fuel tank configuration before purchasing to ensure the correct mounting bracket is selected.

Important Product Information

The Spool Stage 3 LPFP Kit is designed for G-chassis BMW applications and includes a vehicle-specific mounting bracket determined by the fuel tank design.

The standard installation does not require drilling or cutting the factory fuel bucket.

The pre-drilled OEM fuel pump top hat is an optional $50 upgrade.

The Holley Hydramat is an optional $200 upgrade.

The Walbro 450 is recommended for most street, drag racing, and high-performance applications.

The Walbro 525 is recommended for higher horsepower applications requiring additional fuel flow. Spool strongly recommends the PWM harness when using the Walbro 525 due to its higher current draw.

Please provide your vehicle's year, make, model, or VIN when ordering so the correct mounting bracket can be selected.

Note: Harness compatibility, wiring requirements, and fuel pump selection should be verified according to your specific vehicle configuration and performance goals.

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.