Ok lets see what we can do here.
First, take the drip tip off the top of the tank. That is the part you put in your mouth. Set it on a paper towel.
Take the atomizer (the 'tank thingy') off your mod (battery thingy)
Turn the tank upside down and take the bottom off. Put the part with the glass upside down on the paper towel beside the drip tip.
Close the airflow on the bottom of the deck that you just separated from the rest of the tank. Remove the coil you have in it now, and set it beside the drip tip.
Take the deck that you just took the coil out of to a sink, open the air flow over the sink and run water through the top, then through both air flows. Shake it dry, and blow into the top to remove any water that didn't shake out. Set this beside the tank.
Wipe just the outside of the coil, mainly the bottom part, then carefully screw it back into the deck (the part you just washed). Make sure you now have the air flow holes in the closed position. The coil you just put in, should be snug and tight but not forced.
Next, carefully but the deck back on the tank part, be careful that the tube inside goes straight into the coil, and then tighten the deck into place. Again, firmly but not forced.
Use a qtip and clean the tube from the top of the tank. Don't go in to far, we don't want to damage the coil. Use the other end of the qtip to clean inside the drip tip if needed.
Turn your power down, open the airflow about 1/4 and take a small puff, then increase power until you get vapor.
From this point on, you can adjust the airflow for more air and the power for more vapor.
If this didn't fix the problem with the juice, I think you will need to replace the coil head. (little part inside the tank that you just screwed back onto the base before you put the tank back together)
If you have any problem, just reply to this message "more help please".
It is very important, that since this is a top fill tank, that you close your air flow off every time, or else the juice will leak out of the air holes.