A diesel engine shuts down due to fuel starvation. When the fuel filter is removed there's evidence of small amount of water in the fuel which of the following should be done first?

A diesel engine shuts down due to fuel starvation. When the fuel filter is removed there's evidence of small amount of water in the fuel which of the following should be done first?

• A. Replace fuel filter
• B. Clean the fuel filter with methyl hydrate and return to service
• C. Completely drain the fuel tanks and fill with clean fuel
• D. Pour a pint of methyl hydrate into the fuel tanks

Answer: (A)

When a diesel shuts down from fuel starvation and water is seen in the filter, the immediate action is to replace the fuel filter. The filter is the first line of defense for keeping fuel clean and free of water; if it’s contaminated, it can stop fuel flow and allow moisture to circulate, causing further starvation and potential injector damage. Replacing the filter removes the contaminated filtration medium and any trapped water, restoring a dry path for fuel to reach the pump and injectors. Cleaning the existing filter with solvent or methyl hydrate won’t reliably remove all moisture and leaves the system at risk of recontamination. Adding methyl hydrate to the tanks isn’t a guaranteed fix and can alter fuel properties in ways that aren’t appropriate for this situation. Draining and refilling the tanks is a more extensive step and may be necessary if water persists after a filter change, but the first action to restore operation is to replace the filter.

When a diesel shuts down from fuel starvation and water is seen in the filter, the immediate action is to replace the fuel filter. The filter is the first line of defense for keeping fuel clean and free of water; if it’s contaminated, it can stop fuel flow and allow moisture to circulate, causing further starvation and potential injector damage. Replacing the filter removes the contaminated filtration medium and any trapped water, restoring a dry path for fuel to reach the pump and injectors. Cleaning the existing filter with solvent or methyl hydrate won’t reliably remove all moisture and leaves the system at risk of recontamination. Adding methyl hydrate to the tanks isn’t a guaranteed fix and can alter fuel properties in ways that aren’t appropriate for this situation. Draining and refilling the tanks is a more extensive step and may be necessary if water persists after a filter change, but the first action to restore operation is to replace the filter.