Hello there if it's an audi 90 then the fuel pump could be under the body in front of the right handside rear wheel as I have a 1991 audi 90 and it's situated there. But if not then could be inside the fuel tank. But if you have the pump already then you should notice if it's an internal fuel pump or not as it will have a filtered area where fuel will be sucked through and pumped out. Hope that helps
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