[Aarongriffey]

You don’t run them both at once.
Leave the electric turned off until it’s needed.
The mechanical pump will keep you going as always, until it quits. Then you turn on the electric pump.
No use wearing out the electric pump when the original is working fine.
After you have left the vehicle sit for several days you can turn on the electric pump before starting to fill the carb and to check the pump.
Then turn it off and let it rest n keep it like new for emergencies.
I often go through a mile long Caldecott tunnel and a couple of bridges that are more than eight miles long each.
I would hate to have my F1, Or any other car, die in one of those places.
I had a Mustang die in the middle of the Bay Bridge about 40 years ago.
It was late morning. The bridge gang towed me to a gas station, I walked a couple miles and bought a fuel pump and some tools. Walked back to the car, installed fuel pump and got home at dark, the end of the day.
Now in each car I have an electric pump, mounted and in the main fuel line, I have spare points and condenser and an extra coil mounted next to the original.