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Message: [QUOTE="The Brad, post: 1173480, member: 14154"] I'm not sure how air can be sucked into the heads. Everything after the pump is under pressure, nonetheless, I do have a Riffraff FRx which is a metered return. It eliminates the dead head design, but requires a little more volume out of the pump due to the fact that the metered fuel coming out of the heads bypasses the stock regulator. My fuel pressure sender is mounted in the fuel bowl test port after the filter. I've replaced my working IPR, ICP, UVCHs, EBP and tube, and I'm sure a few other things I can't think of right now. My map, baro and EBP all read within .2psi if each other and no oil in the ICP plug. I've run Buzz tests, Cyl contribution tests and Perdels and everything passes, even during a rough idle. My next step will be a compression test (seen with my own eyes) and to try another IDM. Does a faulty IDM always throw a p1316 code, or is it common to have a bad IDM and no codes? [/QUOTE]

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