re: GMC Yukon - Fuel Pump Shuts off Constantly While Filling Tank (SOLVED: update pg 2)

Have had to change the vapor canister on a few GM SUVs for this same problem. Stop topping off when you fill up and you shouldn’t have to do it again.

So I finally got under the car and cleared the lines. I was able to disconnect the vent lines on the tank without disconnecting the filler neck to access everything. Note that having a near-empty tank makes this much easier - mine had about 5 gallons in it and was almost too heavy.