Please understand that not being there makes it more difficult for me. When you installed the HPFP, was the sleeve in the cylinder head undamaged, or was it replaced? Did you rotate the camshaft until the sleeve has reached the lowest point before installing the HPFP? I have a feeling that is where the noise is coming from. That pump is actuated by a lobe on the camshaft. If the sleeve was not fully installed, not in good condition, or if the lobe on the camshaft was damaged, it can be causing this noise. Also, you may have gotten a faulty new pump.
I would take an automotive-type stethoscope and see if that is where the noise is coming from. If it is, remove and inspect it.
Let me know.
Monday, April 3rd, 2023 AT 9:25 PM