Well the first thing you need to do is make sure gas is getting to the carb. If the filter filled up it most likely is. Are you using the choke? To start a 151 the choke has to be pulled out. Pumping the gas pedal does nothing at all because the accelerator pump is vacuum operated and therefore does not work until you are running. There is only one external adjustment on the carburetor and that is the idle mixture screw. If it is an older A1 series carb the screw is external on the manifold flange just right of center looking from the drivers side. If it is a later A2 carb the screw is in the same place but recessed into the flange and possibly has a plug over it. The mixture adjustment will not keep it from starting but it will affect the idle and top end to some extent. The external screw should be turned all the way in GENTLY!!!!!! Then back it out 2 turns, the recessed screw turn in and back out about 6 turns. These are just preliminary adjustments and will need to be reset when warmed up. There is also the idle speed setting which is not usually changed during a rebuild but you want to make sure it contacts the stop and then add about a turn and a half. The float settings are 9/32's from the flange and 3/8's drop. There is a drain plug in the bottom of the carb bowl, you can remove that to see if there is gas going into the carb but be sure to put a rag over the generator to keep gas out of it. If you have gas in the filter and it starts on starting fluid it should run, I would guess the float is stuck or not set right.
12/1952 M100- Departed
AN/TSQ-114A Trailblazer- Gone