I have never heard of using brake cleaner, but I know WD-40 will work!
I doubt just one leaky prechamber sealing ring would cause your car not to start, especially since it was running previously.
If there is air in the fuel line caused by the hand pump, the car will still start on WD-40
If you are trying to avoid WD-40 for fear it will somehow damage your engine, I can assure you it will not.