Fuel water separator

[USMC 1371]

97 7.3
Here in MI the weather is in the 50's one day and mid 20's the next night. Truck was taking a few minutes to get started the last 3 or 4 days. Normally it fires instantly. I put some Diesel 911 in hopeing it would help but this morning it wouldn't start. When I was attempting to turn it over the water fuel light was on. Where is the seperator and how do I drain it.
Also, I had it plugged in 2 nights ago and the following morning it fired right up, but when I left work (unplugged) it took a while to get it started. What's up with that? Am I on the right track? Any knowledge would be greatly appretiated.
I should add that last night I did not have it plugged in.

[351fifty]

Try new glow plugs, they do go out from time to time, and your fuel bowl is located on top the motor, has your fuel water seperator built in as well as a fuel filter, drain it into a clear glass mason jar set it on the bench covered for a bit see the water seperate from the diesel and how much is there, mite be a good time to replace the fuel filter as well

To drain the fuel bowl there is a yellow lever push it left iirc, it will drain under the truck and just left of the crank if your looking at it, good luck

[greasyF250]

You can check the glow plugs for continuity . The plugs going into the valve cover gasket , you'll see larger pins on the 2 outer connections on both sides of the plug. These are for the glow plugs , check for continuity there. open means they are shot . 2 or 3 bad glow plugs will make it harder to start.