Day two of the 64 Valiant
A lot of these supposed fuel system problems actually turn out to be electrical/tuning problems. Rusty’s basic diagnostic tips will put you on the right track.
Friend of mine briefly owned a 390 AMX with what he thought was a carb problem. Went to help him, messed around with the carb with no effect, checked for spark, had that, then I decided we should try to time the motor. Timing was all over the place. Pulled the distributor, the gear was stripped. Gear on the cam looked OK, so he ordered a new distributor gear, we put that in, timed it, got it running well.
Sold the AMX and got a second gen Barracuda, 318 with 340 intake. Car had been sitting a while. He couldn't get it started, again he suspected carb was the problem. So I came over, messed a bit with the carb, then checked spark. None. Problem turned out to be the bulkhead wiring connector. Unplugged that, was full of dust and crap. Blew that out, sprayed it with cleaner, plugged it back in, fired right up.
But then sometimes, of course, the problem is the carburetor.