Lupo 3L does not take gas and goes out

Hello guys, I unfortunately have a huge problem with my vw lupo 3l during the drive he lost power and when I wanted to turn him on again he jumped on but only took gas until 2000 turns and went straight back out since the problem is this: he starts running a few seconds and goes out again,if you press on the gas (full gas or half) he takes it up to 2000 turns and then drains off the lmm I have already installed and tried from another 3l but it is still the same problem start pilot sprayed in and it is still exactly as before someone knows what that can be by chance? hydraulic pump runs normally hydraulic oil is inside lmm can’t be it because I already tried it at vw the mechanic who must work through it and I would like to fix it myself because I’m not just unsolicited but unfortunately I don’t find the error to help you