Ignites the Fuel in Many Cars
This page is the CodyCross answer for the clue below from London, Group 491, Puzzle 3 (Royal Observatory).
Question is: Ignites the Fuel in Many Cars
and the answer is: SPARKPLUG
Word Meaning:
SPARK PLUG — The part of some internal combustion engines which forms a high-voltage electric spark which ignites the fuel-air mixture to begin the power stroke. (Petrol engines have spark plugs. Diesel engines do not have them because the heat from their high compression ratios supplies the ignition.)
Definitions from Wiktionary.