Checking the strainer in your fuel pump should be part of the routine annual maintenance of your oil furnace or boiler. It should also be checked if you are not getting a good oil flow at the nozzle or you have pulsating pressure. To check the strainer, remove the four screws on the front cover with a 5/32 Allen wrench.
You can clean the strainer with a brush and clean fuel oil or replace it with an inexpensive new strainer.
Look at the first letter of the Suntec model number to determine the right strainer. There are different strainers for the A-series, B-series and J or H-series pumps.
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