I own a ‘02 Duramax. GMC HD 2500. I recently was on my way to Boise ID and topped off my tank with Diesel. I then tried to start the rig and it was a very prolonged start, didn’t think it was going to start. Never had that problem before. Took it to the dealership, they said it was the fuel filter. They changed the filter, still did not start right. So I siphoned all the fuel out of the rig, replaced the filter again myself this time. Thought it had to be fuel. Still had prolonged start. Took the truck to another mechanic and had the fuel tank steam cleaned. Lots and Lots of sludge, shale, etc ... bad. Truck did start for them at first. Drove the truck home, now it will not start at all. I have less than 40K on the truck. Anyone have any ideas? Pump? Electronic? The dealership here will probably not have a clue either, had the truck towed there today, not exactly Diesel pro’s. Can you help?