G20 no longer starts

Hey Hello, I really don’t have so much experience with cars yet and I hope someone can help me further. I had a problem with my G20 Chevy Van (Bj89) The windshield had jumped through a rockfall, I figured it all out! off to ATU. Today at 9 am. The Chevy made no problems so far… well ATU installs the new windshield and see there.. it breaks at the installation Hurra (well wonderful ATU worried about DI a new one) I just thought away from here, I want to leave…. The van doesn’t start any more. Ignition goes, engine makes noises as if he wants to start but it seems as if he doesn’t get fuel. Supposedly, however, fuel arrives (according to ATU) spark plug also brings sparks and battery also has juice. Did you cut in some Auto Pilot spray (fuel from the can ?) and he wanted to bubber easily. Had probably not passed then. Spray something in front into the engine, he gets his magnificent v8 sound and bubbert what the product …wums and the thing starts to catch fire. I think there were a few very big ones caught ahja had just filled 80l (I am 100% sure real fuel). Does anyone have a solution? Do I have to pay the full amount if there is something broken? because when I put it off everything went without problems. Thanks already for the help and you a nice WE