That's a good suggestion; the tank is translucent so I can see the fuel level and things seem relatively clean but there might very well be gunk sitting on the bottom that's getting stirred up. I'll plan on draining the tank this weekend and getting a good look at the tank itself.
I feel silly but while I've recently replaced the main gasoline filter and the fine in-line filter, I didn't consider that the fuel pump itself might have a built-in filter. I'll check into that.
Adding the psi gauge also sounds like a no-brainer -- should've done that.
Thanks for the suggestions! I now have my weekend tasks planned out.