WATCH: How did Vettel end up without enough fuel at the end of the Hungarian GP?

Sebastian Vettel drove to a fine second place in the Hungarian Grand Prix – before he was disqualified for a fuel sample irregularity after the race.

The German stopped his Aston Martin AMR21 out on track at the Hungaroring, but following the race, the FIA were unable to extract the required 1 litre of fuel from the car.

Aston Martin announced their intention to appeal, but decided not to pursue that when the stewards rejected their request for a review of the decision.

READ MORE: Aston Martin withdraw appeal against Vettel's Hungarian GP disqualification

So what exactly happened to Vettel's car to leave him short of the required amount of fuel at the end of the race? Sam Collins and Craig Scarborough investigate in the free preview of this week's Tech Talk show.

Watch the video in the player above – and switch to F1 TV to see the full feature, and for more great shows.