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Just an FYI, I believe the pump should only prime if the fuel pressure sensor reads no (or little) pressure. Once pressure is built, it does tend to maintain for a little while when the engine is turned off. But I would imagine that first thing in the morning (when the car hasn't been driven all night), you will always hear it prime. But just because it doesn't for some reason, doesn't mean that the HPFP is failing.
Shiv
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