SPOOL Low Pressure Fuel Pump PWM Activation Harness - BMW

Improve the control, efficiency, and reliability of your BMW's low-pressure fuel pump system with the SPOOL Performance Low Pressure Fuel Pump (LPFP) PWM (Pulse Width Modulation) Activation Harness. Designed to provide proper PWM activation for high-performance low-pressure fuel pumps, this harness includes a genuine Hella Solid State Relay and high-quality wiring components to support demanding fuel system applications.

Many aftermarket LPFP upgrade kits use traditional relays to operate high-flow fuel pumps, such as the Walbro 525. However, running these pumps through traditional relays means supplying constant power at approximately 13.5–14V, causing the pump to operate at full output continuously. SPOOL Performance does not recommend this approach because brushed fuel pumps do not offer the same reliability characteristics as brushless pumps when operated continuously at 100% duty cycle.

Using PWM control allows the fuel pump to operate according to the required output rather than running continuously at full capacity. This helps reduce brush wear, bearing wear, and heat buildup inside the fuel tank, supporting improved fuel pump longevity and more efficient operation.

A Walbro 525 fuel pump can draw approximately 20–25 amps under heavy load and potentially even more under high-pressure operating conditions. The SPOOL Performance PWM Activation Harness is designed with appropriately specified wiring and a genuine solid-state relay to accommodate the electrical demands of high-performance fuel pump applications.

Key Features and Benefits

• PWM Fuel Pump Activation: Designed to enable Pulse Width Modulation control of the low-pressure fuel pump instead of relying on traditional full-time relay operation.

• Reduced Fuel Pump Wear: PWM operation helps reduce brush wear and bearing wear associated with continuous 100% duty-cycle operation.

• Reduced Fuel Tank Heat: Helps minimize heat buildup inside the fuel tank by allowing the pump to operate according to its required output.

• Genuine Hella Solid State Relay: Includes a genuine Hella Solid State Relay for the harness assembly.

• High-Quality Wiring: Uses lightweight, high-temperature-resistant 10/12 AWG Tefzel wiring for improved electrical protection and durability.

• Braided Wire Protection: Includes a Spool Performance wiring harness with a braided sleeve for additional wire protection.

• Deutsch Connector: Features a Deutsch connector for convenient integration with compatible plug-and-play ReFlex systems or custom wiring configurations.

Included Components

• Spool Performance wiring harness with braided sleeve.

• 10/12 AWG Tefzel wire, selected for its lightweight construction and high-temperature resistance.

• Genuine Hella Solid State Relay.

• Deutsch connector for plug-and-play ReFlex integration.

• Matching Deutsch connector end for applications using flying-lead wiring.

Wiring and Installation Requirements

The SPOOL Performance LPFP PWM Activation Harness uses a ground-trigger activation system only.

For installation with a plug-and-play ReFlex system, the positive connection must be disconnected to allow the harness to operate using its ground-trigger activation method.

The harness also includes a Deutsch connector on the end, allowing connection to a compatible plug-and-play ReFlex system. For vehicles or setups using a flying-lead connection, the matching Deutsch connector end is included so the flying-lead wiring can be converted into a plug-and-play connector.

Vehicle Fitment

• Application: BMW low-pressure fuel pump (LPFP) systems.

• Compatibility: Designed for compatible BMW fuel pump configurations using PWM activation.

• ReFlex Integration: Supports compatible plug-and-play ReFlex systems and flying-lead wiring configurations with the included Deutsch connector components.

Important: This is a ground-trigger activation harness. Verify your fuel pump setup and ReFlex wiring configuration before installation. The positive connection must be disconnected when using a plug-and-play ReFlex system, as specified by SPOOL Performance.

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.