Fuel Pump Safety Switch

The MR. GASKET Fuel Pump Safety Switch (SKU MRG7872) is a critical engine protection component designed for fuel-injected vehicles equipped with electric fuel pumps. This pressure-actuated switch serves as a fail-safe mechanism that automatically cuts power to the fuel pump when oil pressure drops below a safe threshold. Mechanics and performance enthusiasts rely on this switch to prevent fuel system damage and engine seizure during low-oil-pressure scenarios—whether caused by cold starts, prolonged idle, or high-RPM operation where momentary pressure dips occur.

The switch operates via a 15 PSI cut-off threshold, meaning it de-energizes the fuel pump circuit when oil pressure falls below this setpoint. Internally, a pressure-sensitive diaphragm responds to oil circuit pressure delivered through the 1/8-inch NPT male port, which threads directly into the engine block or oil gallery adapter. This design ensures instantaneous response without electrical delay, protecting against dry-start conditions and catastrophic pump cavitation. The compact form factor (3.25 x 1.2 x 5.95 inches) and lightweight construction (0.13 lbs) make integration seamless into tight engine compartments during restoration or custom fuel system builds.

Street machines, race vehicles, and rebuilt engines benefit most from this safety switch, particularly during tuning runs or break-in periods when oil pressure behavior is unpredictable. Installation requires routing the oil supply line to a compatible oil gallery port and wiring the switch terminals inline with the fuel pump relay circuit. This switch is ideal for carbureted-to-fuel-injection conversions, LS engine swaps, and any platform where aftermarket fuel system reliability is non-negotiable. Verify your engine block has an available 1/8-inch NPT port and that your fuel pump circuit supports external pressure switch control before purchase.