How to Unclog Furnace Fuel Pumps

What You'll Need
Replacement pump strainer and gasket

Oil furnaces use fuel pumps to pump the oil that runs the furnace. The fuel pump has a strainer which is attached to the blower unit. If this is dirty, the pump will get clogged. So, when you clean or replace the oil filter, it is always a good idea to clean the pump and strainer.

Step 1: Remove Cover

Remove the cover of the pump housing by unbolting it. The cover is located where the oil line enters the burner.

Step 2: Take Pump Apart

There is a thin gasket that will be around the rim. This should be removed next. Next, you will remove the strainer, which is just a wire mesh screen often in the shape of a cup.

Step 3: Clean Strainer

To clean the strainer, soak it in kerosene for a few minutes and then clean it off with the toothbrush.

Step 4: Damaged Strainer

If, after you clean the strainer, you see that it is damaged, bent or torn badly, it should be replaced by a new one.

Step 5: Assemble

Put on a new gasket and replace all other parts as they were.