Possible Water in Oil Tank

[nin28]

Last year I had a whole bunch of issue where my furnace would periodically stop working when it got very cold. I had a bunch of furnace guys come out and the final consensus was that the fuel feed was partially clogged and had to be replaced. They would replace the 1/4" with 1/2" copper. The plumber came out and when he took the old tubing out there was about 3" of ice clogging the end of the tubing. We have a horizontal tank with 2 tubes running to the top of the tank. He stated that when installed the tubing was placed too close to the bottom of the tank and when the water turned to ice, it clogged the system. It looks like the water got into the tank because fuel gauge and its washer had rotted leaving a nice wide open hole. After he finished everything worked fine.

This year I called the same plumber to remove any water in the tank and a guy came out, stuck a steel pipe into the tank, swirled it around, and pulled the pipe out. After looking at the pipe he said there was no water in the tank. However, he did recommend that the tank be leveled because 2 of the tank's legs had fallen off the cinder blocks they were sitting on.

So I jacked up the tank and repositioned the cinder blocks under the legs of the tank to get it fairly level and now during the first below-freezing night, I'm getting the same symptoms of last year of when the furnace would eventually stop running. The flow control flap on the vent will start flapping back and forth for a day or so, i believed indicating a lack of fuel flow, and then the furnace would just cut out.

I'm concerned that when I "leveled" the fuel tank, the water that was resting at one end is now spread along the bottom of the tank. This water is now getting back into the fuel flow and causing the furnace to cut out again.

Does anyone have any suggestions on what I can do? Thank you.

[Cass]

You can continue jacking up the tank so it is tipped the other way and drain out some of the fule...you will know if there is water in it you should be able to see it...and if there is keep going till it runs clear and then add some moisture remover if you can find some for heating oil...try calling the oil company and ask them what the additive is.

I think the pipe had something on the end of it that changes color if it contacts water / moisture..

[Peter Griffin]

There is a product called water finding paste that you can smear on a stick and run down to the bottom of the tank. If you have water the paste turns either green or red (depends on brand) By code, the tank should be pitched 1/4" per foot away from the outlet. Water can be removed in reasonable amounts with a product called AquaSorb. The same product is also breaks up sludge.

[hj]

Automotive gas line treatment HEET from an autostore will absorb the water and get you back into action.

[nin28]

Last winter after I initially had the issues I added a container of fuel additive to get rid of gunk and water. I did it again after a fill up this fall. I forget the brand but it was suggested by my oil supplier. Also, I did get the paste to detect water in the tank and it didn't find anything. Could there be just lingering moisture that could be causing the issue? I will try the HEET additive to see if that finally clears things up. Any other ideas why the oil flow would suffer when I'm right at freezing outside? Thanks.

[jadnashua]

Oil floats on water. All it takes is maybe a tablespoon to block a line if it freezes. So, the detection may not have found any, but you have a little. The addative/treatment causes the water/oil to mix, and not freeze. It isn't technically absorbed, but it does let them flow.

[Wally Hays]

If you are not finding water in the tank then I would not mess with it anymore. Try blowing out the oil line, changing the tank filter and the oil pump strainer.

[nin28]

I'll wait until the next freezing day and see what happens. In the meantime I will add the HEET additive just in case. Thanks.

[nin28]

I'm aware that home heating oil is very similar, if not identical to diesel engine, should I use an additive specific to removing water in diesel engines? Thanks.

[nin28]

A follow up. I bought the following additive, looked up its properties and it looks like it might do the trick:

http://k100fueltreatment.com/k100-products.html

I got the K100-D product.