air bubbles in furnace

[lxhop]

I have an oil fed forced hot air heating system with the oil tank outside under the porch . Since I moved in 13 years ago, I would get air into the furnace and have to bleed it due to the heat shutting off. This would happen only once every year and had no correlation to the tank being filled, nor to the approximate level of oil in the tank ( it's a side-lying tank with no gauge). The problem continued even when I replaced the furnace 8 years ago and the hvac repair man hasn't found any loose connections inside. Does anyone have any idea why this would happen with such regularity and infrequency? Would a 2 line system help in this case? My major concern is freezing pipes,etc if I were to go away for several days in the winter.

[Bubba]

You replaced the furnace because of air in the line? You should have replaced the thermostat. Bubba

[lxhop]

I replaced the furnace due to it's age (?80 years). And what does the thermostat have to do with air bubbles in the fuel line?

[Steve Scott]

You have an air leak in your supply piping. Get rid of any compression fittings and use flares. Pressure test as much of the lines as possible and you'll likely find the leak quickly.

A 2 l>I have an oil fed forced hot air heating system with the oil tank

[daytona°]

Steve hit it right on the head

[Bubba]

Because its the thermostat. Its almost always the thermostat. You'll see. Bubba

[baymee]

Thermostat has nothing to do with it. You have a vacuum leak in the line somewhere.

[daytona°]

Bubbles in the wine barrel................

[Tekkie®]

You need a Bubble-Booster®

[Stormin Mormon]

I doubt that oil lines contain a vacuum. However, they may contain fuel oil at lower pressure than atmospheric.

[Stormin Mormon]

Tiny bubbles in the wine Tiny bubbles, make me feel fine....

was that Don Ho?

[Bob_Loblaw]

"Stormin Mormon" wrote

No, but his wife was....

[baymee]

Definitely a vacuum.

[lxhop]

Actually, I did change the thermostat when I bought a programmable one. And I would still have the problem once every year. And not when I first call for heat. Sometimes there would be an air bubble a month into heating season.

[daytona°]

RLMAO :o)

[Bubba]

You should never rule out the al mighty thermostat. You probably just got a bad one. Replace it again. Its almost always the thermostat. Bubba

[Tekkie®]

Ya got me on that one! BWAAAAAAAAA

[Tekkie®]

Your oil line is farting so therefore needs an enema.

[Stormin Mormon]

How many microns?