Would like to understand logic behind hot start suggestions

[n86121]

The basic requirements are obviously the right ratio of fuel and air for whatever conditions need to be such that combustion will occur.

An old grizzled mechanic, (Danny Fragass, Clinto Aero MD) taught me what he uses on every aircraft that always works, hot cold or in between.

Steps and my thoughts on why it works.

1. Mixture and props forward.
The prop, obviously to keep starter load min, and it should be left that way
Mixture open so you can pressurize fuel system all the way to nozzles

2. Throttle closed
Starting point, ...read on

3. Elec boost pump on
Pressurize fuel system with cold fuel all the way to injectors.

4. Move throttle from closed to open slowly, then back to closed. Maybe 5 secs
Fills fuel system with slug of cool pressurized fuel
My shadin goes up to 17 gph or so at peak before going back to closed,

5. Elec pump off
Cool pressurized fuel is now in the entire fuel system ready for start

6. While hitting starter move throttle forward slowly.
Fires every time.

I BELIEVE
The early steps put a slug of cool pressurized fuel in the entire system, from tank to nozzles.
As the throttle is then slowly re-opened it always hits the right mixture to fire.

And fire she always does!