Hi P1 L1,
I assume this is the race you are talking about? https://igpmanager.com/app/d=resultDetail&id=127139215
It indeed shows that you pitted after lap 51 and retired in lap 52 after running out of fuel.
I'll report this to the devs to look into.
Hi there P1 L1, do you recall how much fuel you selected to add to the car? If you had selected zero litres then this would explain why your car retired. In your post-race telemetry I do not see anything selected for fuel.