P0191 Need to test Fuel pump - Ford F150 Forums - Ford F-Series Truck Community.

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Old 07-31-2015   #1  
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Default P0191 Need to test Fuel pump

2005 5.4L She would have a hard time starting before but after I replaced and fixed everything below she was running really good.

Now back to sputtering, taking a long time to start and now not starting at all.

I have replaced; Fuel Pump, Fuel Filter, FPDM, Plugs and COP's, FRP Sensor, followed the power wire from the FDPM and found it corroded bad so I replaced it, also changed the ground location on the FDPM, I have checked all the wires from the FDPM to the drivers seat, checked all fuses.

I have power to FPDM and I have the diagram for the plug but how can I test (hotwire) the Fuel Pump without lowering the fuel tank? What should be the voltage coming from the FPDM plug? not sure about pin 1 & 6.

How can I test the FRP sensor? what are the specs for voltage?
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Old 08-02-2015   #2  
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Still getting P0191 Fuel Rail Pressure Sensor Circuit Range/Performance.
I have power to the FPDM but the scanner I have shows no fuel rail pressure.
So now I can't even get it to start. I pulled the fuel line off of the filter and turned the key on and a little bit of gas came out maybe half a cup.
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