Minor water pump leak

[el_fantasma]

So after about two years of driving my 72 truck has started running hot while sitting in traffic. I checked the radiator and added about half gallon of coolant. Looking under the trick I see a very small amount of fluid oozing from where the water pump attaches to the block. I waited 10 minutes and there wasn’t even enough to form a drop.

Does a leak like this happen only when the engine is running or while it sits?

I’m not inclined to pull the water pump if I can just check/fill the radiator every six months. I only drive about 2000 miles a year. Pulling the water pump looks like something above my skill level. If this is a new leak, then that’s something else.

Thanks,
Rob