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The pump is not drawing oil but only when when sucking. (You knew that). I would guess that moving the heater caused a small leak in the oil suction line or pluggage in a suction strainer/filter. When primed, everything is OK. So ignitor, nozzle, etc is OK when the prime fluid is present. But the pump cannot draw liquid. Look for a very small leak in the suction letting air in. Look for pluggage in a suction filter. It won't take much air inleak or suction restriction to stop a pump from lifting.
This sounds like an oil leak. Look for leaks at valve covers, and other areas above the exhaust. It often is the burning off of this small volume of oil, that makes the smell like you describe. Inspect the whole exhaust...Something is melting, somewhere.
It is possible that something got spilled onto the exhaust manifold and is burning off. If the smell doesn't go away with a bit of time make sure there is not an oil leak or other fluid leak underhood. Another possibility is that an animal had climbed into the engine compartment and had made some sort of a mess - I have seen it happen before and critters can make a mess sometimes.
I would check all fuel lines, connections, and watch how long it takes to ignite. Kerosene heaters should atomize fuel meaning it should look like a fog not droplets, so that would point to fuel nozzle problems. That being said it should exhaust out side not in to the house, inspect the burning chamber real good for cracks or leakage? If this unit has a flue or damper make sure it has a good draft to exhaust the burnt fuel. This is purely speculation not a solution, these are things I would be looking for if it were in my home. Good luck
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If you have a Monitor heater you need to figure out right
away what is making the odor. Any odor from a Monitor heater could be CO and
that is not good. Look at the back of the heater where it connects to the
exhaust. The little Z pipe should be all the way in at both the stove and the
flue pipe. Take the front cover off the heater and look at the heat exchanger.
This is the part on the right side that has either two or three chambers. Make
sure there are no cracks anywhere. Also look at the back of the unit where the
fuel connects. There should be no raw fuel any where. Beyond this you will need
to get a service guy over and have a good look.
Does it smell like raw kerosene or exhaust. If it smells like kerosene it sounds like you may have a fuel leak. If you can remove the grill, look inside and check for any kerosene in the bottom and in the tray under the heater. You should also check your fuel line for leaks. If it smells like exhaust look inside and on back of the heater for any black soot marks. There are a couple of o-rings, 1 in the exhaust connection in back of the heater and 1 in the flue pipe where the exhaust from the heater connects. There's also several gaskets in the combustion chamber that could be leaking. Hope this helps. If you need any more info, you can send me an email (email@example.com).
probably both and unburnt fuel also. when the unit ran out it still pumped a small quantity of fuel into the hot burner chamber where it turned to smoke and was expelled. carbon monoxide itself is odorless and what is normally referred to as c. o. odor are unburnt fuel products, some of which smell pretty strange.
There are some orings in the exhaust that might need replacing. Do you have a parts breakdown for the heater? I repair monitor and toyostove heaters and can get you the gaskets. I'm in NC. You can contact me at firstname.lastname@example.org
Something to check would be the exhaust vent for leaking. We just replaced our old Monitor 40 because it was making some terrible exhaust smells in our house and it turned out their was a crack on the exhaust line just where it enters the stove. May be worth looking into. They are a lot cheaper than a whole unit!