Description
Product Overview
The Ronybuy 40A Heavy Duty Waterproof Fuel Pump Relay Kit is designed for 12V automotive applications. Featuring a screw‑mount copper contact relay rated at 40 amps, a 30 amp inline fuse, and a color‑coded wiring harness, this kit ensures reliable fuel pump operation. The relay meets UL specifications and operates automatically, delivering up to 480 watts of power. Dimensions are compact at 5.9 x 5.9 x 1.77 inches, weighing only 11.7 oz, making it easy to install in tight engine bays.
![[Product front view showing all components]](https://www.intrepidbuy.store/wp-content/uploads/2026/06/648f4d2731204c1f9e2ffd7095b01c1a.jpg)
Usage
Ideal for replacing OEM fuel pump relays (P/N 30247) in cars, trucks, and SUVs, this kit works with any 12V activation system that does not exceed 40 amps. Perfect for performance upgrades, off‑road vehicles, and harsh environments where moisture resistance is critical. The included wiring diagram simplifies connection to the battery, fuel pump, and trigger circuit.
Why Choose Us
Ronybuy combines robust materials with thoughtful engineering. The waterproof housing protects against corrosion, while the screw‑type connector ensures a secure mount. Each kit is tested for UL compliance, guaranteeing safety and longevity. Backed by a 2‑year warranty and 45‑day money‑back guarantee, you can trust the quality and support.
Key Features
- High‑current 40 A relay delivers consistent fuel pump pressure
- Waterproof design resists moisture and harsh engine bay conditions
- Color‑coded 10 ft 10‑gauge and 6 ft 10‑gauge wires simplify installation
- Includes 30 A fuse and mounting screws for a complete, ready‑to‑install solution
- 2‑year warranty and 45‑day money‑back guarantee for peace of mind
FAQ
Is this kit compatible with my vehicle?
Yes, the kit is a universal 12V replacement for OEM fuel pump relays up to 40 amps, fitting most gasoline and diesel engines.
Do I need additional tools to install?
Only basic hand tools are required. The kit includes a wiring diagram and all necessary hardware for a screw‑mount installation.
Can the relay handle higher voltage spikes?
The relay is rated for a maximum of 12 V DC and includes a 30 A fuse to protect against voltage spikes and overloads.
What warranty does Ronybuy offer?
Ronybuy provides a 2‑year limited warranty and a 45‑day money‑back guarantee on this product.
Is the relay waterproof?
Yes, the relay housing is fully waterproof, making it suitable for wet or humid environments.




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