I see.
Take the CE2 out and inspect the inside of delrin cap to see if it has a scratch or groove cut into it, possibly from pressing the CE2 into the delrin. If it is scratched or is not nice and smooth inside where the CE2 seats you could push out the drip tip tube in the top delrin cap and use it for the bottom and then press the drip tip tube into the bottom delrin cap and use it for the top and see if that works, otherwise you would have to replace the leaky delrin cap.
Bruce from COV will help you with replacing it.
Also, inspect the CE2, make sure that the 1/4" metal piece of the outer tube that you left on the CE2 after cutting it is not loose or scratched on the outside where it forms a seal inside the delrin cap. Also, always inspect the cut part of the CE2 metal tube prior to inserting into the delrin cap to ensure that there are no burs or sharp edges, or that it in not deformed in any way, it should look nice and round after cutting it with the edge slightly turned inward from the tubing cutter. any deformaties after cutting it could score the inside of the delrin cap when you go to press it in there.
You used a steel CE2 and cut it with a tubing (pipe) cutter, right? Because you can't use a CE2 Clearomizer on the MAP
tank. Also, you can't remove the whole steal tube of a CE2 and try and use that either, because it will leak for sure. You have to cut a steel CE2 for it to work in the MAP tank.
You can use the black CE2's, I always try to order the black ones. The black CE2's are the same as steel, with the exception that they are covered with a black sticker. I cut mine with the sticker left on it, easier to mark where to cut it and it keeps the tubing cutter from leaving marks on the steel. Remove the sticker and make sure to clean any glue that remains on the steel from the sticker. I use a paper towel or tissue with some rubbing alcohol on it.
When you go to put the MAP tank back together, lube it up first with some PG or VG only, It makes it easier to put together and take apart. I use one small drop of PG or VG on the end of a Q-Tip and just put a tiny thin coat on by running it along the tank side of the inside part of the delrin cap just touching the O-Rings as I rotate the cap, this way I prevent getting
juice on the top side of the O-Rings. I use just a little bit more than a tiny thin coat inside the delrin cap and the outside steel part of the CE2 before pressing it into the delrin cap.
Here is a link with a video and pics that will help with servicing the MAP tank.
http://www.e-cigarette-forum.com/forum/clouds-vapor/182313-need-help-replacing-ce2-map-tank.html