Stock Fuel Pump

Once you've worked on it on the bench, eventually you may feel more comfortable opening the top on the engine to check for things. The pump may get its fuel from the bottom of the bowl, but that varies from carb to carb. That's why as long as there is some fuel in the bowl, you should have seen some squirt out the shooters when working the throttle. We know there's at least some fuel, even if its low level or it wouldn't run at all. If the engine rpm can be very slowly increased (in neutral) thats another indicator the problem is pump shot, rather than low bowl level or clogged idle-low speed system.