[CobraEd]

Turk, a mechanical pump is just a lever with a rubber diaphram to pump the fuel. Running it dry should do nothing. If you have an electric pump too, that might burn out if it is continually spinning with no fuel to lubricate it. A good mechanical pump is all you need even for 2 carbs. Besides, a mechanical pump only puts out 7-8 psi which is exactly what carbs need. The electric pumps put out 15+ psi which is needed for fuel injection, but way too high for a carb an so requires a fuel presure regulator to bring the psi back down to where it should be. Another thought might be that your electric pump developed so much presure, that it blew out the diaphram in your mechanical pump! Check you crankcase for gasoline!!

So:

If you have an electric pump in series with your mechanical pump, I would check that as your problem, and then throw it away and stick with mechanical only.

Ed