Choosing the right oil pressure switch for your electric fuel pump is essential for protecting your engine and ensuring reliable starting and running. These devices shut off the fuel pump when oil pressure falls, preventing engine damage and flooding the system during stalls or failures. The following selections cover a range of interfaces, from simple shut-off switches to smart controllers, all designed for automotive applications in American vehicles.
Below is a quick reference table of five widely used oil pressure switches and controllers that are compatible with electric fuel pumps. This overview highlights their core functions, wiring considerations, and primary use cases to help you compare at a glance.
| Product | Brand | Key Function |
|---|---|---|
| JEGS Oil Pressure Safety Switch | JEGS Store | Shuts off at 5 PSI; three-terminal wiring for pump, starter, and ignition |
| Revolution Electronics Electric Fuel Pump Controller | Electronics | Priming on key-on; turns off with no tach signal; tach-compatible |
| Longacre 43600 Fuel Pump Shut-Off Switch | Longacre Store | Fuel pump shutoff to prevent engine damage |
| Standard Motor Products PS-64 Oil Pressure Switch with Light | Motor Products | Oil pressure switch with built-in indicator light |
| Holley 12-810 Fuel Pump Safety Pressure Switch | Holley | Shuts off pump when oil pressure drops below 5 psi; detailed instructions |
JEGS Oil Pressure Safety Switch
The JEGS Oil Pressure Safety Switch is designed for all electric fuel pump applications. It shuts the fuel pump off when oil pressure drops below 5 PSI, helping prevent engine damage due to low lubrication. It is intended to be placed in the fuel pump’s wiring circuit to cut current if the engine stalls or a major internal failure occurs. The switch features a three-terminal connection to connect the fuel pump, starter solenoid, and ignition switch, enabling coordinated safety behavior across the starting and running systems. This setup is particularly suitable for performance vehicles and classic cars with custom electrical systems.
Revolution Electronics Electric Fuel Pump Controller
The Revolution Electronics Electric Fuel Pump Controller monitors the tach signal to determine when to allow the fuel pump to operate. As long as a tach signal is present, the pump can run. If the engine stops, the pump stops as well. It supports both stock inductive tach signals and aftermarket square-wave tach signals. For vehicles without a tach signal, the controller can be wired to the negative side of the ignition coil. It also primes the system by turning on the pump for about 3 seconds on initial key-on to ensure the carburetor bowls are topped off. This controller is especially useful in classic cars undergoing fuel system upgrades or where tach signals vary widely between setups.
Longacre 43600 Fuel Pump Shut-Off Switch
The Longacre 43600 Fuel Pump Shut-Off Switch provides a straightforward safety mechanism to prevent engine damage by shutting off the fuel pump when oil pressure is compromised. Manufactured by Longacre, this switch is designed for reliability in racing and performance settings where engine protection is a priority. Its simple operation makes it suitable for users seeking a dependable, minimalistic safety device in their fuel system wiring.
Standard Motor Products PS-64 Oil Pressure Switch with Light
The Standard Motor Products PS-64 Oil Pressure Switch includes an integrated indicator light option, aiding in quick diagnostics of oil pressure status. While the product page lists country of origin and basic dimensions, the switch is typically used in various automotive applications to provide a visual alert when oil pressure falls outside the safe range. It is a solid choice for users seeking a compact, switch-based solution with optional lighting for dashboards or engine bays.
Holley 12-810 Fuel Pump Safety Pressure Switch
The Holley 12-810 is a safety pressure switch that reads oil pressure and will shut off the fuel pump when pressure drops below 5 psi. It includes detailed installation instructions to assist with proper wiring and mounting. Holley is known for performance automotive components, and this switch is designed to integrate with Holley fuel systems or compatible aftermarket setups, providing a reliable safeguard against low oil pressure during operation.
Buying Guide: Key Considerations for Oil Pressure Switches and Controllers
When selecting an oil pressure switch or controller for an electric fuel pump, consider the following factors to ensure proper compatibility and reliable performance:
- Pressure threshold: Most switches shut off around 5 psi. Confirm that the target threshold matches your engine’s lubrication requirements and pump specifications.
- Wiring configuration: Depending on the model, you may need three-terminal (pump, ignition, starter) or simpler two-terminal wiring. Plan the wiring path to minimize voltage drop and ensure safe routing.
- Tach compatibility: Controllers that rely on tach signals require a functional tach output. For vehicles without a tach, verify alternative wiring options or physical priming features.
- Priming behavior: Some controllers prime the fuel system on key-on to top off carburetors. Determine whether priming is desirable for your setup and climate.
- Installation location: Install in a protected area near the fuel pump or within the pump’s wiring harness. Avoid heat sources and ensure accessibility for maintenance.
- Compatibility with fuel system: Confirm that the switch or controller is suitable for your pump type, vehicle year, and any aftermarket electronics in use.
- Durability and environment: Look for switches with robust terminals, weather resistance, and a design that withstands automotive vibration and temperature variations.
- Diagnostics and indicators: An indicator light on the switch can aid troubleshooting by showing oil pressure status at a glance.
- Documentation and install support: Detailed instructions and diagrams reduce installation time and errors, especially in customized builds.
- Safety and compliance: Use switches and controllers that meet automotive safety expectations and comply with local regulations for wiring and fuel systems.
Across these options, you’ll find a mix of straightforward shut-off switches and more sophisticated controllers. For performance-restoration projects, the JEGS and Holley options offer clear cutoffs at a common 5 psi threshold, with varying wiring complexity. The Revolution Electronics unit adds tach-based control and priming, which can improve startup reliability on vehicles with unusual ignition behavior. The Longacre and Standard Motor Products choices provide reliable safety and visual diagnostics, suitable for a broad range of vehicles. Consider your vehicle’s electrical system, ignition behavior, and maintenance preferences when making a selection.