Muddydogs wrote:
I would have filled the tank the rest of the way with diesel and carried on. One gallon of gas in 30+ gallons of diesel isn't going to do squat. Happens to a truck or two every year in my fleet. I think the shop kind of screwed you not telling you to just fill the tank with diesel and keep it full for the next couple hundred miles or so.
I did the same as OP, 3 years ago. First contacted Duramax Diesel Forum and received same advice as Muddydogs gives. Called GMC dealership, their diesel mechanic said good advise. Also said add alittle extra diesel additive for next couple of tanks. Never had a problem.