my car does not work on gasoline

my friends vehicle 2001 model 206xt atiker sequential lpg current business return there was no problem I parked my car I wanted to run in the morning did not work in gasoline, gasoline finished, run it on gas and bought gasoline from gasoline, but again I encountered the same problem, I do not understand, it runs on gas but neither does it run on gas, nor does it work with gas while running. Does anyone have information or ideas about it?

The problem is with the 90% petrol filter.

May also be from a gas pump

Thanks for your answers, my friends car has improved on its own today.

Get well, my teacher, I hope it will not repeat

Do you remember what happened when my teacher made it easy? Because I had the same problem, I did the same things, I also worked on gas. I mean, how much is left in the tank?

To tell the truth, I did not do much, I just bought 50 lira of gas for the petrol lamp to go off 1-2 days after I slept when the car started.