Stop starving your fuel system.

If you’re running upgraded injectors, E85, or a high-flow fuel pump, the factory Honda fuel pump wiring and relay setup is not enough. Voltage drop kills pump performance — and performance builds demand consistency.

Our Honda Fuel Pump Relay Upgrade Kit delivers clean, stable voltage directly to your fuel pump using heavy-duty 10AWG wiring and a fully weatherproof relay, ensuring maximum flow and reliability under boost.

🔥 Why You Need This

Factory wiring is small gauge and routed through aging OEM circuits. That causes:

• Voltage drop under load

• Reduced pump output

• Lean conditions at high RPM

• Inconsistent fuel pressure

• Premature fuel pump failure

This kit fixes that.

⚙️ Key Features

• 10AWG Power & Ground Wiring

Thick, high-current wiring minimizes voltage drop and maximizes pump performance.

• Raychem DR-25 wire shielding 

• Weatherproof Sealed Relay

Designed for engine bay or chassis mounting without corrosion issues.

• Direct Battery Power Supply

Provides stable voltage directly from the battery to the pump.

• OEM-Style Trigger Integration

Factory ECU still controls pump activation — we just give it the power it deserves.

• Clean, Professional Installation

Pre-terminated leads for simple, reliable wiring.

💪 Perfect For

• Walbro 255 / 450 / 525 pumps

• DeatschWerks DW300 / DW400

• AEM 340 / 400

• Radium / custom surge tank setups

• Turbocharged Honda builds

• E85 applications

🚗 Honda Fitment

Compatible with:

• B-Series (B16, B18, B20)

• D-Series (D16 variants)

• H-Series (H22, H23)

• K-Swaps & custom builds

Works with OEM ECU, Hondata, KTuner, Haltech, Link, FuelTech, and standalone setups.

⚡ Why It Matters

Fuel pressure stability = power consistency.

Power consistency = safe tuning.

If you’re investing in bigger injectors and a high-flow pump, don’t choke the system with factory wiring.

Upgrade the relay. Protect your build.

DOES NOT BYPASS OEM HONDA MAIN RELAY 

ONLY USE FOR 1 Fuel Pump up to 450lph. 

FOR 450lph and bigger fuel pumps it is required to bypass the factory connector on top of the fuel hat, drill and run 2 wires to the pump itself.