- Carbon Fuel Services, LLC is a Professional Turnkey Fuel Polishing & Maintenance Company with over 15+ years of combined Preventative Maintenance (PM) experience in the Fossil Fuel, Mission Critical, & Healthcare Industries. CFS performs turnkey diesel fuel polishing, filtration, water extraction, treatment, as well as customized fuel & tank maintenance programs for a vast array of diverse fuel applications throughout the Southeast & Mid-Atlantic States. Contact us today to schedule a FREE Site Visit and Service Estimate by one of our Fuel Maintenance Engineers. (704) 419-9939 "When Fuel Performance is Paramount...CFS Will Be There"