[Diy_efi] Running propane to an extra injector (KISS theory)

[A70Duster at aol.com]

I have some extra low-impedance injectors that I first applied 120 PSI 
compressed air to and the injectors operated correctly.
Then I plumbed liquid propane (from a propane tank with the valve on the 
bottom) to the injector and pulsed it. Again the injector was working 
correctly.

The problem was that a mix of liquid and vapor came out of the injector, even 
after a minute of pulsing the injector. My guess is that the liquid propane 
is boiling in the transfer tube. How does one stop this while keeping things 
simple?!?! Insulate the line can help with heat intrusion and maybe a 
liquid/vapor separator.

I don't want to add a fuel pump and regulator, I can live with tank pressure 
at the injector, but should find out the pressure that the injector doesn't 
open at. And I want to inject liquid propane. Phase change cools the air 
drawn in and I can deliver A LOT more liquid propane than vapor propane.

Why do I do this? With propane at 110 octane and I can get it for $1.30 a 
gallon, I could run on 87 octane gas for cruise and then kick in some liquid 
propane under heavy loads/WOT conditions. This would first be applied to a 
turbo 4 banger, then who knows what is next... >:-)

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