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I hope you are burning K1 kerosene as opposed to off road diesel. Diesel stinks no matter what you do to the heater. A couple things that have happened to me are, fuel selection K1 is it, when storing for the end of the season old fuel can cause water from condensation to build in the tank. When water is in the tank you get ignition and it burns just not hot enough to burn the fuel completely, this causes the heavy odor. Old fuel will do the same it is as if the fuel thickens to an oily state and becomes heavier. It just does not burn hot enough to get rid of the odor. You can try increasing pump pressure this changes air fuel mixture and you may get rid of the odor somewhat.
is the sensor for the thermocouple located in the right spot in the flame,remove it and if you have access to a propane torch,heat the end till its red hot and leave it connected to the gas valve,then start the unit and this will tell you if the sensor is properly positioned in the pilot flame on the unit itself,if not you could have a defective new thermocouple or another safety device keeping it from staying lit or the gas valve is faulty
Check your fuel filter,, could be running out of fuel,due to obstruction in fuel delivery system. Either crud in the tank clogging up the pickup,,or maybe even water in your fuel. Your filter might be it,,have you been running diesel?? check it out....
The igniter is most likely bad.Make sure the igniter is not working,and the pump for the fuel is working,one,or the other is not working,if it is the fuel,order a new pump kit,with impelar,and if it is the igniter,replace it with a new one.
a new flame sensor is in order, if you have spark and it blows fuel then thats the answer. you can get one thet will fit from Mr. Heater for 3 bucks. the wires are different so just splice the to your old wire harness, there is no wrong way to hook them up.