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Message: [QUOTE="Tiha, post: 1563430, member: 33189"] Exactly, I was hoping someone would see that and elaborate on it. That reading is taken off the high pressure rail. It is not the switch that triggers the LP alarm and puts it in limp mode. That switch is calibrated to 30K psi. So a little tolerance is understandable. Reading 42 psi on the scanner as opposed to even say 80 psi. The sensor could be off by that much. That is what .02% tolerance understandable isn't it? And if my PSI was actually less than 53 then the switch would close and I would get the alarm. So the switch would have to be bad as well. I found one thread online where the person said his KOEO psi reading was 350. Like on my 2016. He said he replaced the sensor and the new sensor said 0psi. So he put the old sensor back in and kept running it. LOL and I had thought about just throwing a pump on it but that is a $500 gamble in itself. When I pinched off the return line the fuel rail pressure went to 96 psi. according to the scan tool. The LPFP is internally regulated at 120 psi. Taken that information and apply it to the ASSUMED variance in the pressure sending unit it made sense that the pump was working properly. Regulated at 120 but reads 96 psi. 24 psi off. now add that 24 psi (variance) to the 42 I measure and get 66 psi. Within spec. To me the logic was sound. Maybe I need to make an adapter and put a manual gauge on it. Yuck, I don't want to. [/QUOTE]

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