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Best Practice to unclog fuel lines

AlexMinolfoAlexMinolfo Posts: 3Member
edited August 2019 in Gas Heating
Hi All,

I am currently researching the standard method to unclogging fuel lines connecting heating tanks to furnaces.

Is there a best practice manual or standard for how to remove the clog?

If not, what is the typical industry solution?

Alex Minolfo

EDIT: See comment for clarification


  • Tim McElwainTim McElwain Posts: 4,331Member
    Are you referring to the gas line to the equipment? You need to be more specific in describing exactly what you are talking about.
  • Jamie HallJamie Hall Posts: 12,100Member
    like to start with -- are we talking oil, natural gas, LP?
    Br. Jamie, osb

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • AlexMinolfoAlexMinolfo Posts: 3Member
    Hi Jamie and Tim,

    I am specifically talking about the fuel pipe connecting an above ground storage tank containing #2 fuel oil to a residential heating furnace.

    I apologize for the ambiguity this is my first time posting on here.

  • JellisJellis Posts: 184Member
    I use the Co2 Blowout tool for this. remove the fuel line from the tank and the fuel pump. blow the crud into a waste container (carefully) and then flush the line out with clean fuel.
  • Robert O'BrienRobert O'Brien Posts: 3,163Member
    NORA strongly recommends against the use of CO2 cartridges, they can develop pressures in excess of 800 PSI and can rupture copper oil lines. A hand push/pull pump is the preferred method
    To learn more about this professional, click here to visit their ad in Find A Contractor.
  • STEVEusaPASTEVEusaPA Posts: 3,796Member
    Agree totally with @Robert O'Brien
    If you can’t unclog it with a push pull, replace it.
    Also important to determine why it clogged, or even if it’s clogged. Could be pinhole in supply tube in tank.
    -Bad fuel
    -Dirty tank
    Both would require draining/cleaning tank and/or additives.
    -Filter not at tank
    -Collapsed/pinched fuel line.
  • HVACNUTHVACNUT Posts: 2,824Member
    And no offense, but if you're researching you need to call a Pro. That is not DIY. You dont wants an "oops" with a tank full of fuel oil.
  • AlexMinolfoAlexMinolfo Posts: 3Member
    edited August 2019
    @HVATNUT , None taken. I won't be performing any of this myself. I am simply gathering information to find a
    cite-able source (i.e. manual, standard) for a report I am writing.
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