Hello all, I have an oil boiler (ca. mid 80s, according to previous owner) that every now and then rumbles loudly (sounds like a truck going by outside the house), and spews gray/black smoke from what normally is the air inlet vent on the pipe that leads to the chimney. I have had a couple furnace guys over and they shrug their shoulders and say that unless it does it while they are there they don't know what it could be. I have had the boiler cleaned and the nozzles replaced. One of the guys said if he had to take a guess it might be sludge buildup in the oil tank, so I tried some sludge remover additive that I found at home depot. I figure that stuff is probably snake oil anyway, but it was pretty cheap so I figured I'd give it a go. Didn't really seem to do much. The repair guy stated that some sludge could be making its way to the nozzle that would then starve the combustion of the oil, this then causing the problem. So how do I make this stop?
The oil tank is in the basement and there is a copper line from the oil tank to the boiler. Would cleaning the line out help, or just replacing it? The tank looks old, and has some exterior rust, not a lot though. Could there be a lot of sludge buildup in the tank itself? The boiler works fine most of the time, but it does this every other day or so during the winter while it is running on a regular basis. I am in CT so it only runs right now for hot water. It happened to do it again a few days ago (hadn't done it for a long time), and it got me thinking about it and how to get it fixed. I'd like to try to get this problem fixed before the fall/winter hits us.
thank you,
Mark