[mike knight]

Hey Never,
I would pull a plug and while out check for spark. If the plug is clean and has spark, fuel delivery would be next. Disconnect the fuel line at the carb , put the fuel line into a catch can and with the coil pulled bump the ignition and see if its pumping fuel. if you've got spark and fuel at the carb what do your plugs look like, Are they wet then you may have a seriously flooded engine. My car is fuel injected so I really don't know much about carb setups and what can happen to make them quit pumping.
When my engine quit there was absolutely no warning and when I tried starting I got no pop at all. I located the fuse in line with my relay, it was blown, replaced it and the engine lit off immediately. The reason it wouldn't even bump is the engine had drawn off all of the fuel in the system forward of the pump and regulator. Is your engine even firing on a couple of cylinders? if you've don't even get a couple of cylinders firing then check your wiring from the pump and see if when your trace it that you don't have a fuse close to a relay like mine. If you do get some popping and from what you've said about your engine sounding as though its laboring on start up its possible that its seriously flooded at which point you should let it sit for a couple of days or pull all of the plugs and clear the cylinders. I won't presume to give you all of the timing precautions to take when you pull all of your plugs and wires.
Keep in touch with all of the guys on this site someone knows enough to help you out with your exact setup. This sit is an absolutely incredible resource you just have to be patient and persistent.

mike