Weatherproof Fuel Pump Relay

The Weatherproof Fuel Pump Relay by PAINLESS WIRING (MPN 30131) is a double-pole, 30-amp relay switch designed to protect fuel pump circuits in modern and classic vehicles. This relay is engineered for builders and mechanics who demand reliability in high-demand electrical systems, particularly in engine swap projects, custom fuel system installations, and vehicles prone to moisture exposure. A weatherproof relay prevents electrical failures that compromise fuel delivery, ensuring consistent pump operation under demanding conditions.

The weatherproof design protects internal contacts from corrosion, humidity, and environmental contaminants—critical features when mounting in engine bays, under-vehicle locations, or vehicles exposed to salt spray or high moisture. The double-pole configuration allows simultaneous switching of multiple circuits, useful for coordinating fuel pump operation with other auxiliary systems. Rated at 12V with a 30-amp capacity, this relay handles the full inrush current demand of modern fuel pumps without voltage sag or contact chatter. The included wiring pigtail simplifies installation, eliminating the need for custom connector fabrication and reducing installation time on the bench.

This relay is ideal for EFI conversions, fuel cell installations, and any fuel system upgrade requiring dedicated circuit protection away from the main fuse block. Engine builders and restoration specialists benefit from its weatherproof construction when working in harsh environments or vintage vehicles retrofitted with modern fuel injection. The 30-amp rating accommodates both single and dual fuel pump configurations common in performance builds. Installation pairs easily with aftermarket fuel system controllers, standalone ECUs, and custom wiring harnesses where isolation and reliable switching are non-negotiable.