Megane 1,900 80cv pump

Hi Xtreme23, check the fuel filter connections. I think it's on the passenger-side fender. It might be drawing in air. Make sure there aren't any air bubbles in the clear hose. If you don't bleed the system, it'll run poorly and even stall. Always start with the cheapest and simplest things, because things are really bad these days. Cheers.