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How to diagnose a faulty fuel pump in an Audi 80?

I am experiencing issues with my Audi 80 where it sometimes struggles to start or has a lack of power. I suspect it might be a faulty fuel pump. What steps should I take to properly diagnose and fix this issue?

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First, check the fuel pressure using a fuel pressure gauge. If the pressure is lower than the specified range, it could indicate a faulty fuel pump. Make sure to also inspect the fuel filter and lines for any clogs or leaks.

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