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That pic is small, and you've not described what's worn out, so there's no way to know. Like Tcoat said, if it's questionable, don't risk it.
If there's a lot of miles, It's a good idea to replace it.
If the engine experiences a catastrophic failure, it's a good idea to replace it.
If it has low mileage and you want to save some money, and have some precision measuring tools, you can check the pumps dimensions to see if you're within service or at wear limits.
If you do buy a new pump, it's recommended to disassembly and check the bypass plunger for smooth action. The backplate screws should also have Loctite applied.
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