My other half has an 05 Kia Sportage Diesel. In warm weather when the engine is hot it has issues starting. Eg. been on a driving around then stop for 5 mins at the petrol station or shops then try to start the car and it wont fire or even try to, it just turns over. Leave it another couple of mins and it'll fire up straight away.
To me this sounds like a fuel evaporation issue like you used to get on older petrol engines but never heard this happen with a diesel. But then my experience of oil burners is limited.
Took it to a garage and they had no clue as there was no error codes or the like. So anybody have any ideas?