In our last trip out on the water aboard our 1972 Bristol Offshore Trawler, we experienced one of the most dangerous issues you can have with a diesel engine — a runaway. The engine took off and wouldn't shut down, leading to a very stressful situation. In this video, I walk through what actually caused the runaway of one of our Detroit 4-53 Marine Diesel Engines and the steps I took to fix it. I’ll show the diagnosis, what failed, and what I did to get everything back to normal.