Gas Exhaust Used to Prime Pump An attachment for priming centrifugal pumps with the exhaust from gasoline motors used to operate the pump, is being marketed by Simonis, Ltd., of London, England. The mechanism consists of a two-way valve. In running position, the exhaust gases pass in the ordinary way on to the silencer or muffler. In the printing position, the gases are directed through an ejector which primes the pump and suction. The attachment operates entirely independent of the pump and it can, therefore, be put into action before the pump is placed in gear.