The National Truck Equipment Association (NTEA) has issued a technical report for members and others about a condition that may exist on 2002 General Motors GMT600 cutaway and full-bodied vans.
On certain models, when providing fuel taps for auxiliary generators or motors, fuel flow may be stopped when the vehicle is turned off. This condition is caused by a reverse flow check valve installed in the return port of the fuel sender module. This reverse flow check valve prevents fuel from flowing to auxiliary generators or motors when the vehicle is turned off.
Service Bulletin 02-06-04-056 provides the appropriate VIN and replacement part numbers to correct this issue. To obtain this bulletin, phone 248-489-7090 or e-mail [email protected].