Ok guys,
Other solution:
I've installed on the car an LPG plant with its injectors etc. I could use the LPG with gasoline injectors supporting.
It should not be so ardous: When you drive on LPG the gasoline pump is in operation with minimum pressure so the gasoline return in the tank because there isn't enough pressure to open the injectors, this is what normally happen if you don't fit the "stop/pump".
Now, when the ecu finds a poor mixture the eha increase pressure and so you have enrichment, (this is what I believe).
I think it's possible,I should ask the LPG technician how to programm LPG ecu.