My megane does not start

My megane 1 99 2.0 Buying it to gas because the one who loves me told me that sure The fault were the pipettes that go to the engine and a hose, but a loss in the calefa hose, now I started working on the naphthah and found that the pump is broken does not work, and the worst thing is that you have to change the injection system does not go and it is very expensive for me, but for evils of worse percent, it stops and does not start, I reviewed I did not find the fault, I carry it the electrician and there is no case they get to start and suddenly stop and it does not start anymore, it will be a motor blocking system the former owner says that he does not know what he can not be, of that guy I do not want to speak is a chanta, I hope someone of a clue greets and thanks.-