You are going to have to drop the tank. Consider the hose to the filler tube and vent. They are cheap and can lead to the slow leak code. Also, in front, there are two hoses. One is for the EVAP system and the other is the fuel line from the fuel filter to the fuel rail. The EVAP line is the larger line. It is not obvious because the hard plastic line goes up, over the top of the tank, and then comes out to the rail. The easy way that will save the connector up front it to just disconnect the line at the filter and then release it from the clips when you drop the tank. The connector up front get a lot more abuse from heat, undercoating, and road slush. It doesn't like to release easily. The vapor line is more compliant, but it sounds like you are replacing it.