You did the exact thing I had to do several years ago for my license plate lights. Same connector too. Gotta love the Weather Pack connectors. I'll be checking both the connector and the ground today as soon as I'm back home. With the long list of things I have yet to still check, here's hoping I find the problem quickly.
@CarterTheFarter I was pretty confident it was the pump I was hearing, as I was hearing a slight whirring noise near the fuel pressure regulator when I looked around Friday night, but I'm going to make sure today and verify it actually IS the pump I was hearing. I sure hope the problem isn't the pump itself, since I replaced both that and the filter with OEM Denso units last February.