I agree with Ronnie and Denny, hot starts in the Aztec do not require any
priming.

I showed this method to one of our partners the other day and he was happily
surprised at how easy it started. It's simply a matter of obtaining the
correct mixture for combustion, hot/thin air requires very little fuel, add
fuel and the mixture is too rich. The "fuel pump on, then off, full open
throttle, full lean mixture, crank until your battery, starter, patience are
all worn out" POH method simply sucks. It also recommends starting the left
engine first (carry over from when only the left had a generator) but we
usually start the right first, it's closer to the battery, then we've got an
alternator to help the battery send adequate amps through the 20 some feet
of aluminum cable over to the left engine. The POH is usually the "bible"
but when the airplane changes and the POH doesn't, it can really muck you
up.

I typically can tell when the engines are about to fire, then I begin
advancing the mixture, but not too fast or it will kill the engine. It's a
matter of feeding the engine just enough fuel so the engine driven fuel pump
can keep it running.

The flight school that I used to work with had an Archer that students
routinely had trouble starting, they flooded it continually. They'd come
back into the office saying that "they did the hot start method, then
flooded method, now it barely cranks." I'd show them that when hot, it
started best with the mixture pulled back about 1/2 way, not as the POH
advised.

One thing that aggressive ground leaning can teach is just how lean a hot
engine will run. After a flight, while you're taxiing in, lean the engine
so it will barely run, then enrichen slightly. Make a note of where the
mixture lever is. The engine should start when hot at this same mixture
setting without flooding.

YMMV but once you learn the engine it won't vary very much.

Jim