The copper injector seals should be replaced when you refit the injectors. If replacing them is impossible you need to anneal the old ones. Unless you do this the copper has hardened and won't seal the injector. The new or annealed seals will conform to the injector and seal then harden in place.
Matt
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I have no argument but I'm an engineer and right despite having no argument, so don't argue with me!
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