81 marathonstalls out and spits gas out carburetor!

[Jpstylzz]

I have an 81 marathon. It will run for @ 100 yards , bogs down and does nothing when accelerator is pushed. Then fuel comes out carburetor. It has new feel pump, new carburetor. Feel filter us cl3an. Myself and multiple mechanical friends are baffled. Any have ideas. Seems like it gets too much gas. I could use help before I blow this thing up...lol. thank