Fuel Pump Inertia Switch SKU: 6108

Fuel Pump Inertia Switch | EFI Safety Shutoff | Universal Ford-Style

Adding EFI to your classic Bronco or Ford truck means stepping into modern performance—but don’t overlook modern safety. This Fuel Pump Inertia Switch is a simple, proven safeguard that cuts power to your electric fuel pump during a hard impact or rollover. It’s the same style switch used in factory Ford EFI systems, giving your build a reliable mechanical backup in case things go sideways on the road or trail.

Unlike aftermarket EFI systems that rely only on ECU signals, this switch physically interrupts power to the pump—helping stop fuel flow even if wiring is damaged or the ignition stays on. It’s a small addition that can make a big difference when it matters most.

Pro Tip: Mount the switch in a vertical position with the red button facing up. This ensures the internal inertia mechanism works correctly and prevents false trips or failure to activate during an impact.

• Automatic Fuel Pump Shutoff: Cuts power to the fuel pump instantly during sudden impact, rollover, or collision

• OEM Ford Design: Same style used in factory EFI-equipped Ford vehicles for dependable crash protection

• Mechanical Safety Backup: Works independently of ECU or relay logic—adds protection aftermarket systems don’t provide

• Ideal for EFI Conversions: Perfect for Holley, FiTech, Edelbrock, FAST, or Ford-based EFI swaps

• Compact & Easy to Install: Simple two-wire inline connection using a relay-fed fuel pump circuit

• Manual Reset Button: Red top button allows quick reset after the switch is triggered

This inertia switch is designed to be installed inline on the fuel pump power wire, typically between the fuel pump relay and the pump itself.

Basic Wiring Layout:

• Battery → Fuse → Relay → Inertia Switch → Fuel Pump

Important Notes:

• Do NOT install on ECU trigger wire—only on the pump power feed

• Works with both inline and in-tank electric fuel pumps

• Compatible with all major EFI systems (Holley, Edelbrock, FiTech, etc.)

• Designed to handle typical EFI fuel pump current loads

Mounting Guidelines:

• Install upright with button facing up

• Mount to solid structure (kick panel, firewall, inner fender)

• Avoid high vibration or loose mounting surfaces

When you upgrade to EFI, you’re running high-pressure fuel—don’t leave safety behind. This inertia switch adds a proven mechanical shutoff that cuts pump power instantly in a crash, giving your Bronco real protection beyond what ECU-controlled systems can offer.

This inertia switch adds the type of safety Ford engineered into their own systems, giving your classic EFI swap modern protection without a complicated setup.