FASTSTORM 12V Waterproof Fuel Pump Relay Kit — 60A Heavy-Duty Harness with 10AWG Feed, Inline Fuse, Rocker Switch

FASTSTORM's 12V waterproof fuel pump relay kit is a complete heavy-duty wiring solution that routes full battery power to your fuel pump while protecting the vehicle electrical system from voltage drop and overload. This kit bundles a 60A waterproof relay, a long wiring harness, an inline waterproof fuse holder, a 5-pin rocker switch and jumper wires to give you a reliable, factory-style feed for electric fuel pumps. It’s engineered to prevent voltage loss at the pump, reduce strain on factory wiring, and simplify installation with color-coded leads and a printed wiring diagram. Components are selected for abrasion and weather resistance so the system holds up in harsh marine, off-road, or roadside environments.

How does this kit keep my fuel pump getting steady voltage?

The harness directs battery-positive power to the pump through a heavy 10 AWG feed and a 60A relay so the pump sees near-battery voltage instead of a long, thin factory feed. That stability helps the pump maintain consistent pressure and reduces the chance of electrical overheating or relay chatter on older wiring.

• 10 ft 10 AWG red feed to fused battery +12V
• 60A heavy-duty waterproof relay for high current switching
• 6 ft 12 AWG pump positive lead to minimize voltage drop
• Inline waterproof fuse holder with 30A fuses for safety

What makes this kit weatherproof and durable for boats, trucks, and ATVs?

FASTSTORM selected a sealed 60A relay, an IP-resistant inline fuse holder, and abrasion-resistant jacketed wires to resist moisture, oil, and vibration. Heat-shrink connectors, a relay mounting base, and cable ties are included to create tidy, protected runs that last in outdoor and marine environments.

• Waterproof relay and inline fuse box for splash and moisture protection
• Heat-shrink ring terminals and wire connectors for protected crimps
• Abrasion-resistant wire jacket suited to engine bays and under-vehicle routing
• Relay mount screws and cable ties for secure installation

How straightforward is installation for a DIYer or mechanic?

Wires are color-coded and labeled, and the package contains a clear wiring diagram so you can follow step-by-step connections: battery +, pump +, ignition or switch trigger, and chassis ground. The included rocker switch and jumper wires let you add a convenient manual cutoff or tie into an ignition feed for automatic operation.

• Color-coded leads with printed labels for each circuit
• 5-pin SPST rocker switch with LED for visible on/off status
• Pre-crimped connectors and heat-shrink terminals speed assembly
• Comprehensive parts list and mounting hardware included

Which safety features protect my vehicle’s electrical system?

The kit uses a fuse-protected direct feed and a high-capacity relay to prevent overheating of factory wiring and avoid relay overcurrent. Short-run heavy gauge wiring reduces resistance and the chance of excessive current draw through small factory traces.

• Inline fuse holder and two 30A fuses for overcurrent protection
• 60A relay prevents repeated overloads of smaller control circuits
• Ground lead and secured relay mounting lower vibration-related failures
• Jumper wires and labeled switch terminals help avoid wiring mistakes

Who is this for? This FASTSTORM relay harness is aimed at vehicle owners, mechanics, and DIYers who need a dependable, high-current feed for aftermarket or replacement electric fuel pumps in cars, trucks, boats, ATVs, UTVs, and RVs. It’s especially useful when factory wiring shows age, when installers want to avoid voltage drop on high-demand pumps, or when a weatherproof, marine-capable solution is required. The kit supplies everything needed for a professional-looking, protected install without fabricating custom wiring or hunting for hard-to-find components.

FAQ

Q: Can this kit run an aftermarket high-pressure fuel pump?

A: Yes. The 60A relay and 10 AWG feed are sized to support most aftermarket 12V electric fuel pumps without significant voltage drop.

Q: Is the relay and fuse holder suitable for marine use?

A: The relay and inline fuse holder are waterproof and designed for splash-prone environments, appropriate for many marine and off-road applications.