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If the engine will only run when pumping the bulb what that means is either the fuel pump is bad, or there is something else keeping the fuel pump from working correctly.
The fuel pumps do run on crankcase pulses, if the cylinder that operates the pump has low compression the pump will not operate correctly. So you want to start by checking compression first. If that looks good, make sure the fuel lines between the tank and pump are all tight, with no leaks or holes in them. There is also a pulser line between the pump and the engine block. Make sure that line is tight, and has no holes in in it. If that all looks good, then I would go ahead and replace the pump.
Does that all make sense to you? If yes, did you have any further questions on this issue?