Hollow tapping from fuel rail Duff FPR?
Hello all, in the midst of winter my 940LPT started making a regular hollow tapping noise once warm, it is heard in the cabin where it sounds like a modern diesel, outside it could also be heard emanating from the left wheel arch, when listening with a stethoscope there's no tapping from anywhere in the engine or the fuel pump. However the exact same noise can be heard from the fuel rail once the engine is warm (it taps when cold but no so loudly).
I've heard the Fuel Pressure Regulator also acts as a pulsation damper and this could account for the tapping. Any ideas? I'm tempted to replace the FPR and see if that does it but not keen on spending unnecessarily.
Any info greatly appreciated.
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