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It is not that hard. If you have Haynes book or a Volvo manual. All your doing is removing the injectors from the block and replacing the seals and holders. They are attached by one bolt and you have remove the fuel line from the injector. When you pull out the injector there are two seals and a holder. Replace the seals and holder. Then reverse the procedure to put them back.
You can test for leaks by running the car at idle and spray a small amount of carb cleaner at each injector (not to much). If the idle gets disturbed with spray then the seal is bad.
Mario
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