How to Install a Fuel Pump Module for BRZ/FRS/86
By DeatschWerks | Published: 2026-10-28
Category: How-to Guides
Step-by-step guide to replacing the fuel pump module on your BRZ, FR-S, or 86. Learn the correct procedure, common mistakes, and what to check.
Quick Answer
For a plug-and-play upgrade on 2012-20 BRZ/FRS/86 models, choose a complete fuel pump module like the DeatschWerks X2 with dual DW420 pumps. Installation takes about two hours and requires basic hand tools, but careful attention to fuel system pressure and electrical connections is essential.
Why a Complete Module Beats a Bare Pump
When upgrading fuel delivery on your BRZ, FR-S, or 86, you have two options: a bare in-tank pump or a complete fuel pump module assembly. A complete module like the DeatschWerks X2 integrates the pumps, hanger, and wiring into one unit that drops into the factory location without modification. That means no cutting, no custom brackets, and no guesswork with fitment.
The X2 module uses OEM-type connectors, so it plugs directly into your car's existing harness. This reduces the risk of wiring errors that can cause intermittent fuel pressure or even pump failure. For most owners, the extra cost of a module is worth the reliability and ease of installation.
What to Expect: Time and Tools
Plan for about two hours of work. You'll need basic hand tools: a screwdriver, a socket set, and a fuel line disconnect tool. You'll also need a clean workspace and a fire extinguisher nearby, since you're working with fuel.
The job involves accessing the fuel tank from under the rear seat or through the trunk floor, depending on your model. The process is similar across the BRZ, FR-S, and 86, but always confirm your specific model year and trim.
Installation Steps
- Disconnect the battery and relieve fuel pressure: Start by disconnecting the negative battery terminal. Then remove the fuel pump fuse and run the engine until it stalls to relieve fuel pressure. This prevents fuel spray when you open the lines. Never skip the pressure relief step—it's a safety necessity.
- Access the fuel pump module: Remove the rear seat cushion or access panel in the trunk to expose the fuel pump module cover. On the BRZ/FRS/86, the module is typically under the rear seat on the driver's side. Unbolt the cover and set it aside. Check your model's service manual for the exact access location; it can differ slightly between years.
- Disconnect the fuel lines and electrical connector: Use a fuel line disconnect tool to detach the feed and return lines. Then unplug the electrical connector from the module. Be prepared for a small amount of fuel to spill—have a rag handy. Inspect the O-rings on the fuel lines for damage before reassembly.
- Remove the old module and inspect the tank: Unscrew the retaining ring using a spanner or a large screwdriver and hammer. Lift the old module out carefully. Check the fuel tank for debris or sediment that could clog the new pump. If you see significant debris, consider cleaning the tank before installing the new module.
- Install the new fuel pump module: Lower the new DeatschWerks X2 module into the tank, aligning the float arm and pump position. Press it down and rotate the retaining ring to lock it in place. Reconnect the fuel lines and electrical connector. Make sure the float arm doesn't bind against the tank wall—this can cause inaccurate fuel gauge readings.
- Reassemble and test for leaks: Replace the access cover, reinstall the seat or trunk trim, and reconnect the battery. Turn the ignition to 'ON' without starting the engine to prime the fuel system. Check for leaks at all connections before starting the car. If the car runs rough or the fuel gauge reads incorrectly, re-check the module installation and electrical connections.
Product Spotlight
- X2 Fuel Pump Module w/DW420 Fuel pumps for 2012-20 BRZ/FRS/86: The DeatschWerks X2 Fuel Pump Module integrates two DW420 fuel pumps into a single assembly designed for the 2012-16 Scion FR-S, 2012-20 Subaru BRZ, and 2017-20 Toyota 86. This module fits the specified model years without modification, giving you a true plug-and-play replacement for the factory pump.
X2 Fuel Pump Module w/DW420 Fuel pumps for 2012-20 BRZ/FRS/86 - X2 Fuel Pump Module w/DW420 Fuel pumps for 2012-20 BRZ/FRS/86: The dual DW420 pumps deliver reliable fuel flow and pressure for performance and daily driving. You get enough fuel for high-horsepower builds while maintaining drivability for everyday use.
- X2 Fuel Pump Module w/DW420 Fuel pumps for 2012-20 BRZ/FRS/86: The module is engineered with OEM-type connectors. This ensures a clean electrical connection to your car's harness, reducing the risk of wiring issues during installation.
