What fuel cap will fit the GMC?
The correct Stant gas cap for our vehicles is -Stant-11571 in locking and a G 807 in non locking. The G807 may also be listed as a 10807 or 11807. but don’t worry about the difference in the first two digits as they are only referencing the type of packaging the cap is in. For example I believe the 11807 is a blister pack and the 10807 is a cardboard pack. Also, Napa-Balkamp #7031049. I have no experience with this cap; it may not be locking.