Final answer:
The word 'flood' serves as the answer to this question; it can relate to an event in Genesis or an engine issue when too much fuel is supplied to the carburetor.
Step-by-step explanation:
The 5-letter word that can refer to an event in Genesis or to what happens when you supply too much fuel to your carburetor is flood. In Genesis, the word 'flood' refers to a significant biblical event, often called Noah's Flood, where the earth was covered by water as a judgment by God. In the context of an engine, a 'flood' occurs when too much fuel is provided, and it can prevent the engine from starting because the optimal fuel-air mixture is not achieved.