mine works fine. Yes, it comes from the main tank

Some folks have found that the hose will pop off at different locations.
Operate it ansd see if it is spraying fluid any7where inside or outside under the truck

 

Just finished repairing the leak in the washer fluid supply line on my Ford excursion. The syptoms were a constant dripping of the washer fluid around the back of the wheel and passenger door.
My leak was due to the line seperating at the firewall junction. All I had to do was pull the floor moulding on the pass. side door frame. Next pulled out the plastic quarter panel , then pulled back the carpet and floor liner and voila there it was. Simply shoved the tubing back into the connector and everything now works, Thanks again for those who post their experiences.

 

My break was in the passenger side kick panel where it goes through the fire wall. I hooked it back up and wrapped it in electrical tape.

When the season change from summer to winter (no fall in Canada lol) I found it frozen and when I went to blast it out after a trip to Walmart it rained all over are groceries from the back connection in the roof on the passenger side of the roof lite. Since its not raining washer fluid in your rear cargo area i would start with the passenger side fire wall under the carpet right under the glove box.

 

Mine is leaking out the passenger front wheel well up against the firewall.
I looks like the hose runs UNDER the heater motor and box???

How the heck suppose to get in there?

 

Mine was leaking from under the passenger front door. Here are the before and after photos:

 

lol, it's real easy to get to with the Ex completely stripped down to the bare chassis!

My best suggestion would be to try taking the fender liner out, which would mean taking off all the stuff attached to it. But I think that would give you easiest access.