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oil leaking out of burner housing

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Norm Harvey
Norm Harvey Member Posts: 684
Plugged boiler flues,
Poor fuel pump cut-off,
Blown pump seal (would be pretty significant oil)
Delayed ignition,
Improper pitch of the blast tube,
Firing the burner beyond capacity,

These are just a few of the possible reasons.

Start with a pressure test of the pump.
Put a guage on the jet line,.. runt he burner then shut it off,... pressure should drop no more than 10%ish then hold forever,.. if the pressure drops too much or to zero,.. get a new pump, make sure the blast tube is pitched toward the chamber and clean the boiler flues.



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  • eric_40
    eric_40 Member Posts: 4
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    oil leaking

    I changed my nozzle with the exact replacement and when i turned it back on oil started leaking out of the housing. The transformer and electrodes all had oil on them. What could be causing this?
  • eric_40
    eric_40 Member Posts: 4
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    I think it may be lealing where the coupler goes onto the pump.Does this mean the pump is bad?
  • Norm Harvey
    Norm Harvey Member Posts: 684
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    Dont guess,... test.

    Put sa guage on the jet line then run the pump,... if its leaking where you think it is you'll be able to see it.

    Generally pump seal leaks are not minor,.. theyre a mess.

    Clean up the housing,.. put a guage on it and test.

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  • bruce_21
    bruce_21 Member Posts: 241
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    If it didn't leak before you worked on it the odds are something you did has led to the leak. Check the things you touched in changing the nozzle. Is the nozzle tight in the line? What about the union to get the nozzle assembly out of the burner? Is anything cross threaded?
  • Weezbo
    Weezbo Member Posts: 6,232
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    pilot error *~/:)

    did you see a retro feriengial diastrom within the Combustion chamber surrounding the flame retention head when you did the combustion test?

    Honestly , i hope you didn't...it is imperative that you correct for that immediately...pick up the telephone and call an oil tech..AND leave the thing turned off ....

    i do not know you from Adam, however i will tell you the truth...You may not be able to post a reply if you continue in that endeavour ....
  • coalcracker
    coalcracker Member Posts: 51
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    One of your connections is loose as bruce said, and the fan sprayed it all over the inside of the housing.

    Another tip; never overtighten the nozzle. It's not much more than hand tight.
  • Vinnie Smedick_2
    Vinnie Smedick_2 Member Posts: 17
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    It is possible when you bled the fuel pump, oil got sucked into the burner housing. You didn't say how much was leaking out. I have seen a small stain on the floor and oil sprayed on the inside components from this.

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  • Jim_47
    Jim_47 Member Posts: 244
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    oil burner leak

    another very common error that is made is when the thumb nut is put back on the J-tube its put on backwards, preventing the oil line from seating correctly. The Thumb nut has a concave side and a flat side. Concave faces outward.
    Also its more than just replacing the nozzle. Did you inspect the retention head? Is it there? Is it blocked?
    There is more to this heating tech stuff than just changing a nozzle.
  • Weezbo
    Weezbo Member Posts: 6,232
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    i have seen a top tech,

    nearly lose his life because he believed what a homeowner said to him ,without testing things as he normally would and following his regular pattern of doing his work properly.

    i hate to tell you this buh you definitely first establish why you should even be discussing playing with the guys life in this instance...

    there are plenty of reasons for fuel oil to be loading into a fire box. if it burns down his home or neighbourhood no amount of penance all of us could do would ever remedy that.

    Think about it.....you got time....


    I tend to think ,that what Norm is saying is right and i tend to think that when you are coming from a good place trying to help Eric figure out a cause is a good thing, buh he is not someone who has had the benefit of much experience or education at what he is doing. it is clear.

    that the nozzle holder may have a crack in it, or the gun be back to far in the draw, the pump seal the problem,what "Seemed" like a tightly threaded nozzle, loose fitting of the gun to the oil clean cut solenoid ,whatever,...all true all possibilities, buh would you take a second to consider how far away the fire department might be away from his home ....or what he does if he does not "Get" why cleaning the stack of expended oil into the combustion system and ends up needing an ambulance or worse yet....?

    Eric , Why did you change the nozzle?

    is it something you have seen the techs do every time they come to your home?

    if so, you may need to avail yourself of some classes or reading some books from NORA or stop by oil tech talk at Allan Mecurio's site or read some books on that one specific piece in the fuel delivery system. i am not picking on you i rather you were safe and doing whatever work you are good at in the world...Everyone's work is important,it is part of a much larger Work.
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