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I work for a fuel company and do the furnace work for the fuel oil and propane furnaces.
I had a call this afternoon after a customer had run out of fuel in his 500 gal underground
tank. Fuel was delivered and he opted to bleed the line himself. I was called after he couldnt get the line bled. I took the line off the filter cup just inside the basement wall and turned the valve on, no fuel. I attempted to blow the line back with a compressed air cartridge thinking the line had gotten plugged as a result of running out of fuel. Could not get any air through the line. With such a solid plug, I'm assuming water was drawn into the line and froze. Today has been the first time the passed few days the temperature has risen above -10 or so, and -30 with the wind chill. If the line is frozen, how can one aid in thawing the line out aside from an additive?