Mechanical fuel pumps have one way check valves- - - -they are only supposed to flow from the tank to the carb. If you put much air pressure to the pump in the reverse flow direction, you probably destroyed the check valves. Try disconnecting the fuel line at the carb and see if gas can be pumped into something like an oil bottle at cranking speed.
Battery voltage at open circuit with no load means exactly nothing. Check the voltage at the battery posts (not the cable terminals) after 15 seconds of cranking with the ignition disabled (center coil wire pulled out of the distributor cap and grounded) The voltage WHILE STILL CRANKING should be 10.5 V or more. Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt! There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway Love your enemies and drive 'em nuts!