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P0191 Diagnostic Trouble Code Discussion for May 2015

Fuel Rail Pressure Sensor Performance


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Trouble Ticket Help Requests for DTC P0191
Help Request Posted
2008 Ford F-250 Super Duty XLT 6.8L Cuts out, Misfire VIN: 1FTSW21Y88
P0191: low fuel rail pressure. runs fine and smooth. under acceleration falls flat on its face. I am wondering if the control module could affect the pressure. or if its the regulator? i was led to believe that the pump wont run if its the module...??? I can get the regulator only from ford...
May 15, 2015
2008 Ford F-350 Super Duty XL 5.4L Hesitation, Cuts out VIN: 1FDSF30558
came from 2 other shops, that replaced 5 fuel pumps in a row never left the shop oem., bogs down, no power, hot under load . this is reading warm with no problem FRP at 40 psi, FP% 40 psi, FRP DSD 40%.readings under med, heavy load hot FRP 6psi, fp% 41 ,FRP DS...
May 27, 2015
2008 Ford F-350 Super Duty XL 5.4L Hesitation, Cuts out VIN: 1FDSF30558
came from 2 other shops, that replaced 5 fuel pumps in a row never left the shop oem., bogs down, no power, hot under load . this is reading warm with no problem FRP at 40 psi, FP% 40 psi, FRP DSD 40%.readings under med, heavy load hot FRP 6psi, fp% 41 ,FRP DS...
May 29, 2015