The National Truck Equipment Association has issued Upfitter Integration Bulletin #61 to advise that General Motors has made a fuel system change on 2003-model-year GMT 610 cutaways and full-size vans with all engine applications.
This change has resulted in increased pressure in the fuel return line. Many upfitters use this return line to provide a fuel tap for generators and auxiliary engines.
For more information, phone Upfitter Integration at 800-875-4742 or access www.gmupfitter.com.