Fuel Pump Cutoff For Carbs Options

[Spoke]

I'm preparing to install a 2056 dual Weber carb engine in my car and was thinking about how to control the fuel pump. I'll use the existing FI fuel pump relay as done many times before by grounding the appropriate pin on the FI ECU connector to energize the relay with ignition on.

I want to add a safety feature to power the fuel pump only when the engine is running. This is done with all FI systems in case of accident so the fuel pump doesn't keep pumping if the engine has stopped. I want the same functionality with carbs.

I'm designing a PCB to power the fuel pump like DJET systems do: Turn the key on and the fuel pump charges the system for 2 seconds then turns off. When the engine starts turning, the fuel pump will run.

I forsee 4 wires:
GND: picked up on a chassis lug near the relay board
12V switched: Picked up on the FI ECU socket
Relay: Picket up on the FI ECU socket
Coil Neg: This goes to the tach as well.

The coil negative would be the signal to indicate engine running.

Should I consider any other functionality of the fuel pump controller? Anyone interested in a PCB like this?

Does a 2 second precharge do anything for a carbed engine? I could see if the carb bowls were not full but other than that, not sure a precharge does anything.