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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 34186
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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E 350: got high fuel pressure change fuel pump fuel pressure

Customer Question

got high fuel pressure change fuel pump fuel pressure sensor and fuel pump driver module
Submitted: 1 year ago.
Category: Ford
Expert:  Ron replied 1 year ago.
Hello and thank you for your question , What size engine are you working on and what are your actual fuel pressure readings?
Customer: replied 1 year ago.
6.8
Expert:  Ron replied 1 year ago.
Okay, so what are the fuel pressure reading you are getting and what type of problem are you having?
Customer: replied 1 year ago.
Fuel pressure is 68
Expert:  Ron replied 1 year ago.
Normal fuel pressure on a running engine on the 6.8 is 55 to 65 PSI, what type of problem are you having?
Customer: replied 1 year ago.
Code P0191 won't pass smog because check engine light comes on.
Expert:  Ron replied 1 year ago.
The P0191 code can set simply because the Powertrain Control Module (PCM) is trying to hard to raise or lower fuel pressure, even if the fuel pressure appears to be correct compared to the FRP Sensor reading. With all you have replaced then any of the following can still cause the code to set,Fuel FilterFuel LevelFuel PumpFuel Pump CircuitIn order to determine the cause run the test steps I have enclosed in the link below, copy and paste the link to your browser to open and view them.https://dl.dropboxusercontent.com/u/104923897/P0191%20Jul%2020.pdf
Customer: replied 1 year ago.
Replace fuel filter and fuel pump
Expert:  Ron replied 1 year ago.
Okay then run the test steps I sent you to check the circuit.

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