The Ford Barn - View Single Post - Fuel Pump Oil Pressure Shut Off Switch Question

JayChicago · 03-18-2020, 07:29 PM

Mike in Tucson raises a good point. The aftermarket oil pressure cut-off switches are designed to carry the full current to a fuel pump. But a switch off a modern car, if designed to just send a mini-volt signal to the ECM, would not work on our cars.

I guess the same would be true with inertia switches. The inertia switch I pulled off a 1990's car appears to be designed for full amperage to the pump. It has no. 14 wire, was located in the trunk near the fuel pump. But maybe other modern cars use an inertia switch designed to just open the control circuit to the fuel pump relay, and then would need to be wired that way on our cars.

03-18-2020, 07:29 PM	#13
JayChicago Senior Member Join Date: Jan 2019 Location: Chicago Posts: 732	Re: Fuel Pump Oil Pressure Shut Off Switch Question Mike in Tucson raises a good point. The aftermarket oil pressure cut-off switches are designed to carry the full current to a fuel pump. But a switch off a modern car, if designed to just send a mini-volt signal to the ECM, would not work on our cars. I guess the same would be true with inertia switches. The inertia switch I pulled off a 1990's car appears to be designed for full amperage to the pump. It has no. 14 wire, was located in the trunk near the fuel pump. But maybe other modern cars use an inertia switch designed to just open the control circuit to the fuel pump relay, and then would need to be wired that way on our cars.