1972 GMC 350 quad not starting

[tk1251k]

It started fine has a miss but after turning it off and removing the dist. cap it turns over but wont start. All I did was remove the rotor.cap and checked the points buttoned it back together and now have a truck that wont start.I am all of a sudden thinking fuel pump. I can look into the front of the carb while moving the throttle and see gas coming out the right side front barrel but none from the left. I took the line loose into the carb and ran ran the open end into a bottle and gas comes out but not sure if its enough. I did put a new filter in not long ago. Any ideas as to why a sudden not start.