I have a question on the evap drain line for my 2003 F150. The majority of the drainage seems to be coming out from under the truck, but a portion of it is finding its way inside, in the passenger floorpan. I can't see the actual drain from above or below, so before I start pulling apart the truck to get a better view, I want to see if anyone has a better knowledge of this problem. Thanks

 

Sometimes leaves and other debris get in through the fresh air intake and get stuck and trapped at the evap drain. Have bee able to blow compressed air back through the drain to break some of it loose and allow it to drain.

 

Thanks Hanky. Any advice on the easy way to access the drain? The Haynes manual I have shows the drain, but says "transmission removed for better access". Dropping the trans isn't an option, so I assume I can find it going through/under the dash or something similar?

 

If you have a picture of the drain, you can access it. The Haynes Manual shows the pic for easier reference. It may be kinda tight to get to it, but we have used coat hangers and gently probe the drain to remove any debris. The drain should be close to the transmission hump on the firewall passenger side.