On Friday morning, West Coast port officials told CNN about a startling sight: Not a single cargo vessel had left China with goods for the two major West Coast ports in the past 12 hours. That hasn’t happened since the pandemic.
As so, the name doesn’t refer to the type of fuel the watercraft uses, so the fuel type can be a variety of different fuels depending on the vessel itself.
Do you have a source for this? Anywhere I look says that bunker fuel refers to heavy fuel oil which is very much not diesel.
Another one directly from the bunker fuel supplier https://www.crownoil.co.uk/guides/bunker-fuel-guide/
https://www.brookesbell.com/news-and-knowledge/article/what-is-bunker-fuel-a-complete-guide-158816/
The article then goes into more detail, including diesel discussion.