It did "suck and blow" the right direction, didn't it? It is possible to put the one-way valves in backwards in some fuel pumps and no telling how much training the pump assemblers had.
I'd pull the arm pivot pin, remove the arm, run a bolt through the pin's hole and put a nut and lock washer on the bolt to prevent oil leakage. Mount an electric pump near the gas tank and keep as much of the gas line as you can. The electric pump should push gas through the disabled mechanical pump with no problem.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
| 
