Suzuki: 1990 suzuki samurai, suzuki samurai, vehicle that runs

Question
my suzuki don't start all the time. when i put gas in the carbulator the car start. is the one that have the top injector (FI).It have a new fuel pump and i put the ECU in my other suzuki and the ECU works ok. Don't have any idea what is the problem. PLEASE HELP ME. THKS.

Answer
What about swapping the injector from the other Suzuki?  If it runs then you will know it was the injector.  You could do a swap of whatever part is suspected from a vehicle that runs.
Have you verified that the fuel pump is actually making the correct pressure?