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Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 21175
Experience:  40+ yrs. experience as a licensed oil & gas technician.
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I ran out of oil and need to bleed my older oil pump/furnace

Customer Question

I ran out of oil and need to bleed my older oil pump/furnace now that I've had oil delivered. I do not see a bleeder valve as described in most of the instructions online. How can I bleed the furnace without one?
Submitted: 1 year ago.
Category: HVAC
Expert:  Rick replied 1 year ago.

I need a picture of the fuel pump on the side of the burner (where the oil line connects). You can post a picture here by clicking on ADD Files next to the SEND button

Customer: replied 1 year ago.
I was just working on that! I have 2, let me know if they are enough. Thanks!
Expert:  Rick replied 1 year ago.

Can you back out and give me a wider shot showing the whole burner?

Customer: replied 1 year ago.
I've attached three. Two with a wider view and one with a picture of the top of the pump and connections to the burner itself.
Expert:  Rick replied 1 year ago.

Great, the last shot is what I needed. Disconnect the flared nut where that tubing connects to the side of the burner. Then bend the tubing so you can direct the oil flow into a container. Then turn the burner on (hit the reset button) and let it run until you get no more air/bubbles. Once the air stops turn the burner off (if it hasn't locked out already) then reconnect the line and turn the burner back on (hit reset again)

Customer: replied 1 year ago.
Ok, I have to go get a wrench that fits that flared nut. I tried to use pliers, but that didn't work very well and It seems like a better idea to have the right tool. Also, as a clarification, if the burner doesn't shut off by itself and the air/bubbles are done, do I shut it off with the switch (looks like a light switch) or the reset button? My guess is the switch, but I want to be sure. Thanks!
Expert:  Rick replied 1 year ago.

You're welcome. The switch is best to turn it off if you have to.

Expert:  Rick replied 1 year ago.

Be careful to not kink the tubing when you bend it. It's not likely but a possibility

Expert:  Rick replied 1 year ago.

I'd appreciate a favorable rating

Customer: replied 1 year ago.
I also bought a piece of tubing so I only have to connect that to the copper tube so I won't have to move it too much. Unfortunately, I can't get the flared nut to budge. Could I use something like WD40 or just more brute force? I'm trying to turn it to the left if you are facing the burner.
Expert:  Rick replied 1 year ago.

You turn it counterclockwise as you face the side of the burner. It shouldn't be that difficult to get off. WD40 won't help, it's not corroded.

Customer: replied 1 year ago.
I think I am just having trouble because the spot it a bit tight and the wrench is fairly short so there isn't great leverage. I'll try again with more courage!
Expert:  Rick replied 1 year ago.


Customer: replied 1 year ago.
I think you are going to earn your money today. I got the nut loose, attached my tube and hit the reset and nothing came out. I tried again in case it needed more time. I've attached a picture. I hope the line isn't clogged, but this has happened before and I've had a technician out and he's been able to get it going. Thoughts?
Expert:  Rick replied 1 year ago.

Well given the age of this burner I'd say a clogged line is a high probability given that you ran out of oil. Probably clogged at the tank. Turn off the valve at the tank then disconnect the line at the filter outlet then turn the valve back on and see if you have any flow

Customer: replied 1 year ago.
Well, that nut is an entirely different size and too big for the adjustable wrench that I bought to fit the other one, so I'm stuck again. I've run out of oil before, fairly recently even, and not had a clog. If there is a clog in the line, can I fix that or will I need someone to come out?
Expert:  Rick replied 1 year ago.

If the line is clogged it will have to be blown out. If you have an air compressor you could give it a go but if you don't even have the right wrench to disconnect the line I doubt you'll be able to adapt your compressor to the oil line. You probably need to call a pro

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