I recently had a road draft tube act as if it were leaking out the tube, Cleaned and painted it, new filter and checked surfaces for mating, used some Hylomar on gasket surfaces. Still leaking, I knew my engine was ok because it never leaked a drop and all of a sudden was leaking out the draft tube quite heavy when run hard.
I jacked the car up and I laid down under the car with the motor running wiping the tube clean with a rag and found it was coming from the back side of the tube. I traced the leak and found a tiny pinhole in the canister about a quarter inch from the tube between the motor and tube. This is right where the oil should be flowing back into the engine and it is also the low point in the canister which is where condensation would settle and rust it out. There was a tiny spot on the newly painted canister where the paint had peeled off and in the middle of that spot was a tiny pinhole that would create a drop about every 30 seconds or so. This drop would form a small stream and flow down the back side of the tube and around the tapered edge so it looked like the oil was coming from inside the tube.
Something to keep in mind when dealing with a leaky draft tube is that it may be coming from outside the tube due to condensation corrosion around the tube or canister.
Although I had it off 2 times for cleaning and painting I never discovered it so if you take it off, pick around the bottom of the canister with an awl. It was a relief finding the real problem, thats an easy fix, motor problems aren't.
55 Vicky & customline
58 Rack Dump, 55 F350 yard truck, 57 F100
59 & 61 P 400's, 58 F100 custom cab, 69 F100, 79 F150, 82 F600 ramp truck, 90 mustang conv 7 up, 94 Mustang, Should I continue?