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How to clean underground oil tank?
I have a 1945 H.B. Smith boiler which uses oil. The oil tank is underground and when the oil level is 12 inches or lower, it doesn't run consistently. It shuts off and I think it's because of all the residue/soot on the bottom of the oil tank. I have put in new filters but it doesn't help.
Does anyone know how I can clean the oil tank to remove all the residue/soot. Thank you.