Winter camping trip with my 6.0

[headviking]

This past weekend my son (13 yr old) and I ventured up north to Tobermory (between Lake Huron and Georgian Bay) for a 3 night winter camping trip. Talk about cold. I prepared the truck in my usual fashion, oil change (5w-40 sync) fuel filter change. First night the weather changed and a snow and wind storm hit us, no problem. We where well prepared for the cold. The second night was a bit better not as much wind and no snow fall. But Sunday night the wind was so strong that the tent was almost ready to blow over. Lucky I staked it down. This morning, on our way back home I noticed that my fuel pressure gauge was showing me 58psi, normally I was seeing 68psi after the fuel spring upgrade. About an hour into the drive I pulled in to fill up (about 1/2 tank). I first poured in some "power stroke diesel kleen", (almost a quart) before the diesel went in. After about 1/2 driving the fuel pressure gauge went back up to 68psi.
Any ideas to why? Is it possible that I was on my way to having my fuel starting to gell? What did I just dodge?

[Newman]

Your fuel was probably partially gelled.

[Galaxie]

What were the temps? What state is your deisel from?

[headviking]

I have heard of the fuel crystallizing in the filter from gelling. Is this a possibility? If so do I have to change out the filters again?

[headviking]

Originally Posted by Galaxie

What were the temps? What state is your deisel from?

The temp reached -5F at night without wind chill factor. I live in Ontario, Canada.

[Galaxie]

Oh yea! Gel!

[headviking]

So when my fuel pressure gauge was at 58psi instead of 68, I was gelling? By adding a quart of "Diesel Kleen" to my fill up I reversed the action?
My question now is. Do I need to replace my fuel filters, because of something called crystallizing in my filter?