Not exactly how I wanted to spend my day.

I had similar with daughters Mitsubishi Lancer wagon a few years ago replaced pump as all indications were the pump, same issue drop tank to get to pump, I did the same cut an access hole in back floor, to change what was thought to be dodgy replacement pump was not the pump wound up being the cradle the pump fitted into the wiring at the connection to the main harness to pump was intermittent so hit a decent bump or pothole suddenly no fuel