Fuel contamination by water and dirt may cause poor diesel engine performance. Extreme care must be exercised when storing and handling fuel. Fuel-tank caps, dispensing nozzles, and hoses should be kept clean to eliminate potential sources of contamination. Fuel injectors and pumps are especially sensitive to wear and abrasion from particulate matter in fuel. Regularly removing water from storage tanks, vehicle fuel tanks, and filter bowls is important. Dry storage systems help reduce fuel emulsion problems, injection system corrosion, and microbial growth.