I recently helped my son rebuild the carb on his 73 I6-200 and it now has trouble starting. The car had sat for almost 2 years and had a lot of crud and water in the carb so we soaked it good and blew out all the passages that we could find. The engine will start pretty easily with a squirt of starting fluid and then idles decently. When it is running tapping the throttle does provide a nice squirt of gas but there is no such squirt when the engine is not running. I assume that is why it won't start on its own, no initial fuel in the intake from pumping the throttle. Why wouldn't the accelerator pump work with the engine not running?