[Dennis Kelley]

GAsoline evaporates in high temps. Two to three weeks doesn't seem like that long of a time, but how hot is it in your garage. Even if your floats are low there should still be a shot in the accelerator pump. I had a truck that did the same thing and it was a bad diaphram in the fuel pump. I believe you has a bad pump thereby causing fuel to flow back instead of forward.

Later

dennis