we used the fuel pump to empty the petrol tank, we did this to see if it was working and it was working fine. (we didnt empty the entire tank like that though lol)

Loose connection or cut of switch, like i said i could start the car now and leave it running untill it ran out of fuel without it cutting out. I have checked for leaks and connections didnt find anything.

How how do i check the cam/crank sensor?