Jeff, correct me if I am wrong, but don't fuel injected engines typically
have a return line back to the tank because the system has to be at a
constant pressure, so under low load or idle situations fuel is being dumped
bank into the tank?

If so, couldn't the fuel pump be allowed to run a few minutes to
recirculation the fuel so it doesn't boil?

Maybe someone else will better knowledge than me on this.

Fred Johnson
Reno, NV


Jeff Scott wrote:

Vapor lock is common in almost all fuel injected aircraft engines, but it's
not the gascolator that overheats.  It's because the fuel injection
distribution block  is sitting on top of the hot engine, so gets heated
enough to easily boil the fuel following engine shut down.  Thus the hot
start problems with most injected aircraft engines.  In flight it is cooled
by the air intake on top of the engine, so never vapor locks once there is
sufficient cooling air moving through the air inlets.  



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