Cryptic crossword clue
Motor sport’s influence mounting — it’s to do with fuel 4,2

The most common and most likely answer to this crossword clue is the 4 plus 2 letter word FILL UP

F
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L
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The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does FILL UP mean?

FILL UP noun
  1. An act or process of filling up; a replenishment.

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