Gas pouring out of carb

well, the good news is your fuel pump is working fine


hardy-har-har

i dont see a fuel filter in the video, i take it you have one?

my next step would be removing the float bowl and carefully inspecting the needle and seat
too high a fuel pressure can force fuel around the needle but it is much more likely that you got some junk in the there and the needle is not properly seating and that is allowing fuel to pour through

now, when you say the carb was rebuild, the big question is...who did it?