I remove the pump from the engine when I replace the impeller on my T6.354 160hp. I bring it home to my workbench and change the impeller there. I use crazy glue to keep the key in place. I like the idea of making a dimple in the key though. I must say it is tight working in the engine compartment but practice helps. Early this summer I worked on the injection pump and solved a small fuel leak. That required lots of time in the engine compartment.
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