Parked on a hill for the night to allow the truck bed to drain for the forecasted rain.

In the morning jumped in the truck cab and started up. I rolled back about a yard and it felt like someone had poured a glass of water on my right foot
that was resting on the brake. Looking down a stream of water was pouring from under the dash. Ever seen this before?

I've noticed the driver side carpet has been damp before.

Where's the water getting in and how do I stop it?

 

Most likely the windshield. Have a glass company come cut it out and reseal it

 

Isn't there also some seam sealer down below the cowl cover that can leak on these? Brad is probably right but you may look deeper if thats not it.

 

Before you call the glass company I'd check under that cowl. Over time leaves build up under there and need to be cleaned out anyway. Both of my trucks have had the cowl seal fail.

 

Cowl seal? I gotta hear this.

 

Have a look at this thread.
There's a lot of good information in there;

https://www.ford-trucks.com/forums/1...1986-f350.html

Mine is doing it too. I hope to take care of it when I replace my hood.
Can't afford to have my truck down for even a day at this point.

 

weve had some intense storms here in md lately and ive noticed my driverside floor mat always has a puddle on it after a good storm. let me know what you come up with im curious to know.

 

Also, check the seam sealer on the driver and passenger side roof gutter seams. I had the water leak on the floor and had a glass company reseal my windshield twice and that didnt work. I looked on my roof rails and noticed the seam sealer was cracked so I went over it with some more and that sealed it up.

 

Funny you should mention this as today and found the driver's side roof rail was worse and both sides are cracked badly. In fact, as the seam leaves the rail and meets the corner of the upper portion of the windshield I see a gap with a loss of paint too.