smoke volume

I just purchased an MTH 4500-hp turbine and I'm trying to figure out why it wont smoke. I've checked the heating element inside the loco and its hot, the fan is working, tho no smoke is forming! The fluid I'm using is the "Proto-Smoke" that came with it since I've lost my other bottle of fluid...

I want to change the smoke volume in a MTH Challenger Steam locomotive. I already know that you can modify the smoke volume toggling Function 18, and that It can be varied in three levels: low, medium and high. However It is not enough for me. I consider that the Locomotive should throw more...