Well pumping it does absolutely nothing as they don't have accelerator
pumps..

The way I've found these crank the easiest cold is: pull the choke fully on,
floor the accelerator and crank for about 2-3 seconds then release the
accelerator. If it doesn't pop off when you back off the gas, floor it
again for a couple of seconds and then let off again. This pulls more fuel
into the engine when the pedal is floored and when you back off it shuts
off the air, the engine goes rich and it fires off. They will crank just
pulling the choke, it just takes a lot longer. Once it fires off, turn down
the choke until it will just stay running as these cars foul plugs real
easy.

Hot you shouldn't have to do anything (don't choke it!!!) except maybe give
the accelerator pedal just a touch. Remember it's really an air pedal, not
a gas pedal. Of course if it doesn't want to fire and it seems flooded,
floor the accelerator while cranking.

Each car seem to be a little different in the way it likes to be cranked and
it all depends on how it's set up. It should need to be choked to start
cold, if it doesn't it's too rich. If you have to choke it hot, it's too
lean.

One other "trick" that makes these run a bunch better is to swap in a 79-82
280ZX distributor. It's simple to wire these up (2 wires go from the dist
to the coil), you remove all the balast resistor BS, it gives them great
spark and the tach still works, unlike many aftermarket ignitions..