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Is there a way to check if a diesel injection pump works before you fit it to the engine?

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You can test the injector pump by hooking the steel fuel line back up and bleeding the engine to spray some fuel at a cardboard. An alternative and safe method is to do calibration as the mechanics do. These checks for leaks, spray angle and many other things. You can consult your mechanic for advice.

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Hi thanks for your tips. What do you mean by bleeding the engine?
I'm trying to test the bosch 0460494024 VE 4/9 F21000 R22. At the moment it's lying on my workbench. Someone suggested spinning it with an electrical drill.
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