Klaus and I were brainstorming today and he told
me Airflow Performance, with their mechanical
high pressure fuel system, fixed the hot start problem
by installing a return system AKA purge valve :)
http://www.airflowperformance.com/
http://home.comcast.net/~rbelshe/
What it does is purge the air from the fuel system after the
airplane sits around and heat soaks after a flight.
Return systems handle this automatically as Dave Leonard
pointed out.

Apparently you turn it off once the engine starts.

I came up with an idea to fix the constant fuel pressure
problem (RX8 pump in the tank) with a non return system
using a standard regulator mounted next to the pump. Plump
a vacuum hose back there from the intake manifold and the
pressure ratio between the  fuel system and intake  manifold
will stay constant.

Paul Lamar
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