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High-pressure fuel pumps can malfunction and/or fail due to a number of factors. Diagnosing issues with these pumps isn’t too difficult if you know what to look for.
This is from an Audi TSB and shows what a high-
pressure fuel pump follower looks like after the owner decides to skip an oil change. 1. Lack of Maintenance The main destroyer of high-pressure fuel pumps is a lack of oil changes. Wear between the camshaft lobes and the high-pressure pump follower prevents the pump from generating enough piston movement. Less movement of the pump means less pressure. You should always examine the lobes on the camshaft before installing a new and very expensive high-pressure fuel pump. A lack-of-power complaint may improve, but it will never be completely corrected.