Hello all, I have a G64B engine with the stock mechanical fuel pump that makes a tapping sound while idling, the sound appears to be up in the top of the engine and not down in the block. I replaced the hydraulic lifters but that did not remove the sound. The cam shaft is in good shape and isn't scored and the rockers are all in good shape. The truck only has 73k miles on it. And seems to be running fine and even survived a 2000 mile road trip. Are these engines just a little noisy? I have included a video of the engine while warm and in idle but the sound in the video is different than how it sounds in person https://youtube.com/shorts/ZIRZuF-IX...pCHZjZcZbjE3rq