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Bard 9021-003 is an OEM 3450 RPM single stage oil pump used on Bard oil fired furnace burner assemblies to deliver a steady fuel supply for reliable ignition and consistent combustion. A worn or weak pump can show up as hard starts, nuisance lockouts, or unstable flame, so replacing it with the correct Bard factory part helps restore proper burner fuel pressure and dependable heat output. Confirm compatibility by matching your furnace model and burner setup in the Bard parts list, and verify rotation and inlet or outlet port orientation before ordering to ensure a direct fit.