Posted by MarkB_MI on January 30, 2022 at 03:18:01 from (96.59.224.67):
In Reply to: gelled diesel fuel posted by Charlie M on January 29, 2022 at 17:01:56:
I have had good luck with Power Service diesel additive in the outdoor tank of a fuel oil furnace. NOT Power Service 911, but the regular Power Service 'Diesel Fuel Supplement +Cetane Boost'. K-1 Kerosene and #1 diesel are hard to find around here, plus it's a lot easier and cheaper to dump in a quart of PS than to add enough kerosene to prevent gelling. I always buy fuel in winter months, when it's supposedly blended for cold temperatures, but I've found leftover fuel from the previous winter is susceptible to gelling. So I now always add a quart of PS as soon as it gets cold enough to run the furnace.
When diesel fuel gels, it doesn't all turn to pudding. Rather, paraffin crystals form in the fuel and get trapped in the filter. Paraffin trapped in the filter doesn't necessarily thaw out when the temperature warms up, so change the filter element before trying to restart the furnace. Make sure fuel can get through the fuel line to the filter (assuming the filter is below the tank), change the filter and re-prime the furnace oil pump.
In case you don't know how to prime the pump, you'll find a bleeder nipple on the pump. Attach a 1/4 inch ID clear plastic tube to the bleeder and run it to a container to catch the fuel. Find the restart button on the pump controller, hold it down and count to 30. The light on the controller should flash after 30 seconds (maybe 45 seconds); release the button and the pump should start running. Open the bleeder and watch for fuel running out the tube. When the fuel in the tube no longer has air in it, close the bleeder and the furnace should fire up.
Sometimes the pump nozzle will clog up shortly after a gelling incident, so it's a good idea to have a spare nozzle on had in case this happens. A furnace with a clogged nozzle will usually fire up but won't burn well enough for the flame detector to detect a flame, causing the pump to lock out after a few tries. The pump data plate should tell you what nozzle it was originally installed with, but double check when you change it out in case it's been changed to a different nozzle.
I buy filter elements, nozzles and other fuel oil furnace parts on Amazon.
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