[patrickt]

I would first check the accelerator pump. You have a 30cc pump in your 4160, which should be squirting a volume of 3cc on each good full stroke of the pump. So, run your car for a minute or so to get the front bowl nicely filled, then shut the engine off. Tuck a sandwich baggie (or some other suitable receptacle) around the squirter, get back in the car, and with the engine OFF give the accelerator pedal five nice, hard pumps to the floor. Pull the baggie of gas back out, trying not to spill it, and pour it in to your graduated cylinder. If you don't have 15cc's of gas in there then repeat the test. If you consistently fail this test, then you've found the problem and we'll figure out what's broken on that circuit.