How To Upgrade your BMW N54 Low Pressure Fuel Pump w/ Walbro 450 *EASIEST WAY*
AR Mods Upgrade: Low Pressure Fuel Pump Replacement
Introduction to the Issue
- The speaker introduces a video focused on modifications made to support a Stage 2 Plus MHD setup, including various components like downpipes and intercoolers.
- During initial test drives, the car experiences issues with breaking up at high RPMs, particularly noticeable around 4,000 RPM where low pressure fuel pump readings drop significantly.
Diagnosis of the Problem
- The speaker expresses concern that the issue may relate to the low pressure fuel pump rather than the high-pressure fuel pump.
- A stock low pressure fuel pump is shown, which was easily removed; references are made to available YouTube tutorials for guidance.
Upgrading Components
- The new Walbro 450 pump is introduced as an upgrade purchased from eBay. It includes necessary components such as connectors and tubing.
- An adapter from BMP/Precision Racing is highlighted for compatibility with BMW's quick disconnect fitting, simplifying installation.
Disassembly Process
- The speaker details how to disassemble the old pump assembly carefully while preserving parts like the level sensor and organizing cables.
- Caution is advised when heating components to remove them due to potential fire hazards from residual fuel smells.
Reassembly Considerations
- After cleaning and repairing parts of the assembly, there’s a discussion about using rivets versus nylon zip ties for reassembly; nylon zip ties are chosen for their resistance to E85 fuel.
- The process of installing the new pump into its housing begins, ensuring proper orientation for optimal function.
Assembly Process of a System
Initial Setup and Preparation
- The speaker discusses the importance of keeping components organized in buckets for easier assembly. They mention drilling holes for zip ties to temporarily hold parts in place.
- After cleaning, the speaker prepares to assemble the upper part of the system using zip ties again, indicating a methodical approach to reassembly.
Final Assembly Steps
- The float component is routed back into its designated holders, with specific attention given to color-coded connections (brown and red).
- The speaker notes that all connectors are weather-sealed, ensuring durability. There’s uncertainty about the placement of one piece but plans to position it at the back temporarily until a final decision is made.