Re: '71-'72 9.5 hp evinrude wont run with out choke
You could check the fuel pump for a cracked diaphragm as follows (below).... and note that pumping the fuel primer bulb is in effect acting as a manual fuel pump. If pumping the fuel primer bulb causes the engine to run properly, then somethiing is not right with the small fuel pump BUT if pumping the fuel primer bulb makes no difference, then that would indicate a carburetor problem.
(Fuel Pump Diaphragm Test)
(Two Hose Type Only)
(J. Reeves)
Note: This pertains only to the regular Two Hose type fuel pumps.
Leave the hoses attached to the fuel pump. Remove only the two screws that attach the fuel pump to the powerhead. Re-insert those two screws and install a nut to each of them so that the fuel pump is securely clamped together. With the fuel line attached to the engine, pump the primer bulb while observing the pressure/vacuum operating hole on the back side of the fuel pump. Should any fuel leak out that hole, the diaphragm is faulty.
If the diaphragm is faulty, the fuel pump will require rebuilding or replacing. Note that repair kits are not available for all fuel pumps, in which case replacing the pump would be necessary.