Re: did someone pee in my racor?
Check for water every couple of dozen hours of operation. Do the check before you start your engine and it will have plenty of time to separate out and fall to the bottom.
Once it's done that you'll see a clear demarcation between the fuel and the water.
All you really have to do is make sure water doesn't fill the bowl - that would make fuel passage / filtering impossible, what I'm saying is when you drain you don't have to get every last drop, this isn't Maxwell house coffee.
Here's the good news, by opening up your system you've made possible another lesson in diesel maintenance, bleeding the fuel lines.
The clear bowl comes in handy for this too - make sure you never see any bubbles in it.
Lessons learned are opportunities earned.