Before lower-grade gas pumps can be used again, companies like Tank Cleaning Industrial will have to clean them out.

A new product from Algae-X International is said to remove sludge and water from smaller diesel engines, such as those found on trucks, generators and farm equipment, while optimizing fuel quality.

Diesel fuel is generally very clean when it leaves the refinery. But it can pick up contaminants as it travels through pipelines, terminals, delivery trucks, underground storage tanks and dispensing ...