Mystery Water Leak

[mgambuzza]

Been quite a while since I posted/queried. We bought an old house needing complete restoration (1835), along with a barn on its last leg. It took a year to get the barn back, stabilized, and straightened, so I could finally get my A in so I could work on it again.

Two items sprung up from the drive to the new location (40 miles), and then sitting for almost a year and a half. The fuel shutoff failed, allowing the tank over the winter to leak on the driveway(ouch) and a pretty significant water leak while driving.



The shutoff, now with the tank empty was a snap, and now works flawlessly. The water leak I initially thought was the radiator due to the volume and proximity of the apparent leak. I replaced the radiator, but again, I'm experiencing water leaks (that I really cannot see when idle - seems when driving). Wondering if it could possibly be the water pump leaking while I'm driving, as I cannot see while it is in motion. Picture below - wondering what type it is, and opinion on what I would best replace it with.