Question 1

When the engine quits, the first diagnostic question should be…

Accepted Answer

Does it crank? — it splits the fault into electrical versus fuel/air — Crank or no-crank cleanly separates the starting circuit from the fuel and air supply, so you work the right system.

Question 2

Steady BLACK exhaust smoke usually means…

Accepted Answer

Too much fuel or too little air — overload or a choked air/fuel filter — Black = overfuelling or air starvation; blue = burning oil; white = unburnt fuel or coolant. The colour names the unhappy need.

Fault-finding at sea

This lesson is part of a paid course