Robert,
What are you referring-to by "Leaks out of the draft tube and wants to come out."
Are you referring to leaks around the base of the road draft tube, where the base of the tube enters the block? Didn't the silicone sealer around the base take care of this?
Or, are you referring to drips out of the draft tube?
If you are referring to drips coming out of the draft tube, how long are you driving your truck (the length of time from cold-engine-starting to stopping/parking the truck and checking the road draft tube)?
As Bill posted, drips out of the road draft tube can be normal, especially if the engine has not been running warm for a while.
Even if you are not taking long trips (and can therefore expect drips) take Bill's advice - check for mesh being there, and then soak the tube in kerosene or diesel fuel (after soaking, you could drain it and use some water-soluble grease remover on the mesh inside the tube).
Are you losing coolant (after letting the coolant-level reaches its normal distance below the top of the tank)?
