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Ok, so the new fuel pump has solved the problem. It has started right up every time for the past five days. Interestingly enough, they said that when they tried to pull the fuel pump out of the fuel tank they realized that the fuel tank was warped. They had to keep it an extra day to replace the entire fuel tank. Now I'm just waiting on the passenger side window trim piece to come in so they can replace that too. I noticed shortly after I had my windows tinted that something inside the door had put a pretty deep scratch in the tint. They said they found the problem and ordered to the part. They also said they would replace the window tint.
They probably couldn't get the old pump out without damage because it would no longer fit through the hole in the top of the tank.
For some crazy reason, GM decided to make the vaguely circular hole on top of the tank approximately 0.001" wider than the vaguely cylindrical plastic body of the pump. Getting the pump in and out is always a huge hassle. Why couldn't they have given, say, a quarter-inch of clearance?