[urq] electrical?

[DGraber460 at aol.com]

I have solved my oxygenated fuel induced vapor lock issue by putting a  timer 
relay on the injector fan. I trigger it when I shut down, and it runs for  16 
minutes, and it starts no problem. On occasion I forget to trigger it and  
without fail I will be waiting 15 minutes for cool down and restart.
My question is- how can I wire it to trigger on shut down automatically? It  
must be a momentary trigger, as the relay will reset every time the "tickler  
wire" is powered. Therefore I don't think a "normally open" or "normally 
closed"  relay will work.
Any ideas? 
 
Dennis
Denver