As a student, I had a project which consisted in failure mode analysis of an automotive fuel injection system "Bosch K-Jetronic". It was installed in the WW Golf 1 and 2GTI and also the Porsche in the seventies. It was the first competitive and reliable alternative to the carburetor and it had a component which I believe could be usefull for our engines.
It is a simple accumulator mounted after the electric and mechanical pump and before the fuel injection servo.
The b position is when you cold start the engine : The spring is unloaded
The a position is when you are running your engine : The fuel pressure load the spring.
When you stop your engine, the fuel pressure normally drop but with this system the fuel pressure is kept for a short time (maybe half an hour or an hour) and this is told to avoid vapor lock and hot start difficulties.
I believe in this case engine shut down should not be by cutting the mixture but by putting off the ignition as in a car. Also this implicate that we should have an "anti return" to fuel tank valve.
I think I need help to know if it would be really useful or not.
I apologize for my english and so hope this will be understandable.
Have a good day