China diesel air heater squirts

Moin to all inventors, I hope for your help with the following problem: Recently I installed a China air heater 5 kw. Problem No.1: the exhaust pipe gets so hot that it probably melts the seal mass and gets rid of proper smoke, even in the passenger compartment is diesel smell. Problem No.2: partly drips out a lot of diesel outside. I hope you can help me further. Greeting Enrico