Kamui Kobayashi believes a possible fuel leak was to blame for his fiery exit from Friday's practice in Germany.
Putting in the laps in the afternoon session, the Caterham driver was forced to pull over and was seen running from his car.
Moments later a marshal ran towards the smoking CT05, spraying it down with a fire extinguisher while Kobayashi also grabbed one.
By the time the fire at the back of his car was out, his green Caterham was completely white.
He said: "In FP2 we went out for the first run early and completed ten laps. The car balance felt much better with the changes we made over lunch but it immediately felt like it was down on power, it just felt strange.
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