Renault van?

Would be grateful for any other additions as to why it runs then stops.

Diesel not Turbo runs stops then won't start garage breacldpwm called out couldn't fix towed to garage that had worked on it. its happend three times.

I've suggested it could be the fuel tank vent. When filled air is pushed out by fuel. To run air must enter via venting, so currently he will be contacting the garage for that theory as some overlook that possiblility.
many thanks