Rajan Wilcox
The oil furnace fuel pump, also known as the fuel unit, is responsible for getting oil into the combustion chamber and producing heat to warm your home. If your oil pump is broken, you can replace it by shutting off the power and fuel valve, removing the pump, and replacing it with a new one. You will also need to replace the tubing and bleed the air.
| Characteristics | Values |
|---|---|
| First Step | Shut off the power and fuel valve |
| Second Step | Pull out the pump |
| Third Step | Replace the pump with a new one |
| Fourth Step | Replace the tubing |
| Fifth Step | Bleed the air from the new pump |
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What You'll Learn
How to know if your oil pump is broken
The oil pump, or fuel unit, is responsible for getting oil into the combustion chamber. It does this by drawing oil up from the storage tank and then pressurising it to about 100psi. It then sends the oil to the burner nozzle, where it combines with combustion air and turbulating devices before being sent into the chamber.
There are several signs that your oil pump is broken. One of the most obvious is a leak. Leaks can usually be found around the fittings, valves or filters. A leak will cause the pump to lose its prime because it will allow an air bubble to enter the line. You may also notice the presence of raw fuel oil on the floor or a strong odour of fuel oil near the tank. A loose nozzle in the oil pump can also cause problems. If the nozzle is not securely fastened, air will be allowed to enter the fuel line, resulting in the fuel pump losing its prime.
Other signs of oil pump failure include strange noises, seizing, or oil leaks. If you suspect your oil pump is broken, it is recommended that you call a skilled technician to diagnose the problem. They are better equipped to check for other signs of a failing oil pump and can ensure that the problem doesn't get worse.
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How to replace an oil pump
To replace an oil pump, also known as a fuel unit, you must first shut off the power and fuel valve. The pump can then be pulled out. The drive shaft is flat on each side and fits into a matching socket inside the burner assembly. Once the pump is removed, replace it with a new one, then replace the tubing and bleed the air. Finally, run the pump.
There are several videos online that show how to bleed the air from the new pump once it is installed. It is recommended that you get a technician to inspect your oil pump and determine if you need to get it replaced.
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How to bleed air from a new pump
Bleeding the air from a new pump is a simple process. First, make sure the power and fuel valve are shut off. Then, use a small crescent wrench or pliers to slightly loosen the bleed screw. Make sure the screw remains on the pump and is only a little loose, so it doesn’t fall off when you bleed the oil furnace.
Next, turn on the furnace. As the furnace starts to suck fuel in, air and fuel will spit out of the bleed screw. Keep your pliers or wrench on the screw ready to tighten it. This will also ensure the screw remains in place, if you did loosen it too much.
If the furnace cycle ends before the air and fuel mixture stops sputtering, you’ll need to push the reset button again to continue the bleed process until the furnace pushes out all the air from the line. Some furnaces may have a lockout system that won’t allow you to reset more than one or two times. If this happens, you can override the lockout by holding the reset button in until the furnace kicks in again.
Be prepared for a hiss of air followed by a stream of oil. Let the air and residual oil flow until you see a steady stream of pure oil without any air bubbles. Once you’ve eliminated all the air from the line and have a steady flow of oil, carefully close the bleeder valve by turning it clockwise.
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How to cross-reference a Sundstrand pump model to a Suntec
To remove an oil furnace fuel pump, you must first shut off the power and fuel valve. The pump then simply pulls out. You can then replace the pump with a new one, replace the tubing and bleed the air.
To cross-reference a Sundstrand pump model to a Suntec, you can reach out to an expert who specialises in your situation. You can also contact an HVAC Technician, who will be able to help you find a suitable replacement for your Sundstrand pump.
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How to convert a fuel oil furnace to diesel
To remove an oil furnace fuel pump, you must first shut off the power and fuel valve. The pump then simply pulls out. To replace it, you must fit the new pump's drive shaft into the matching socket inside the burner assembly, replace the tubing, bleed the air and run the pump.
To convert a fuel oil furnace to diesel, you must first turn off the furnace. Then, locate the fill pipe and pour in your desired amount of diesel. You should use a clean container to pour the diesel into before adding it to your tank. A good rule is about 5-10 gallons for a day. Close the tank fill pipe and wait about 15-20 minutes. Then, restart your furnace. This may take a few tries, as the diesel may need time to bleed through the lines. While you can use diesel or kerosene in an oil furnace in an emergency, they’re not ideal long-term solutions for keeping warm.
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Frequently asked questions
With the power and fuel valve shut off, the pump just pulls out.
The oil furnace fuel pump, also known as the fuel unit, is responsible for getting oil into the combustion chamber. It then produces heat that will transfer through the rest of the system and finally heat your home.
You can get a technician to inspect your oil pump and determine if you need to get it replaced.
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