Fuel Pressure Sensor Location

[sevobuck]

I recently threw the P0191 code "Fuel Rail Pressure Circuit Range/Performance". I was not hauling anything just driving along at about 60mph. The only engine mod I have is a Volant Intake. I have read that this can be a "ghost" code and rarely comes back. Also, correct me if I am wrong but when the dealer gets a hold of it they usually swap out the sensor and maybe do something with the ECM? I have an appointment next week and I want to mark the sensor so I know if they change it. Where is it at so I can do this.



On a side note others have reported an increase in power and fuel economy after this code is fixed correct?



Thanks

 

[sevobuck]

30 views and no one knows where this is?

 

[Lightman]

I recently threw the P0191 code "Fuel Rail Pressure Circuit Range/Performance". I was not hauling anything just driving along at about 60mph. The only engine mod I have is a Volant Intake. I have read that this can be a "ghost" code and rarely comes back. Also, correct me if I am wrong but when the dealer gets a hold of it they usually swap out the sensor and maybe do something with the ECM? I have an appointment next week and I want to mark the sensor so I know if they change it. Where is it at so I can do this.



On a side note others have reported an increase in power and fuel economy after this code is fixed correct?



Thanks

If you look on drivers side of engine where the fuel injector lines come from the head and all hook to the fuel rail the fuel pressure sender is on the fuel rail the only wiring going to the fuel rail hooks to the fuel pressure sending unit

 

[sevobuck]

Thanks! I found it.

 

[CDonaldson]

I had the 191 code also. I took my truck in to have it checked, no trouble found. They cleared the code and it has not been back. I suspect the did some kind of a flash, but I KNOW they did change the sensor. I marked the sensor beforehand and when I got it back - no marking. They also changed the defuel valve. Neither part was recorded as changed or installed on my invoice, so I must have gotten a round-robbin part taken off someone elses truck. Musical parts? I also noticed an increase in power but no change in my fuel mileage, in fact, it got a little less. I have not had the problem return.



When I spoke to the tech, his thoughts were that the fuel rail pressure may have dropped to below whatever the computer believed a safe operational level. That to me signaled the possibility that the defuel valve may have stuck open at a defueling point. After reading several posts here and on other sites, I learned that this valve failure is pretty common. So, I picked up a rail kit just in case I'm out somewhere and need to block the defuel off. Got it in the old toolbox as an emergency backup just in case the valve sticks again. I am a little hesitant to install the rail kit and leave it there, only because if the pressure were to build up too much I could have other more expensive issues. You can't win for loosing.



CD

 

[sevobuck]

Thanks for the reply. I took my truck in and here is my short rant on what they did. See this post How much was onw of those rail kits and where did you get it?

 

[TAbbott]

I had the 191 code also. I took my truck in to have it checked, no trouble found. They cleared the code and it has not been back. I suspect the did some kind of a flash, but I KNOW they did change the sensor. I marked the sensor beforehand and when I got it back - no marking. They also changed the defuel valve. Neither part was recorded as changed or installed on my invoice, so I must have gotten a round-robbin part taken off someone elses truck. Musical parts? I also noticed an increase in power but no change in my fuel mileage, in fact, it got a little less. I have not had the problem return.



When I spoke to the tech, his thoughts were that the fuel rail pressure may have dropped to below whatever the computer believed a safe operational level. That to me signaled the possibility that the defuel valve may have stuck open at a defueling point. After reading several posts here and on other sites, I learned that this valve failure is pretty common. So, I picked up a rail kit just in case I'm out somewhere and need to block the defuel off. Got it in the old toolbox as an emergency backup just in case the valve sticks again. I am a little hesitant to install the rail kit and leave it there, only because if the pressure were to build up too much I could have other more expensive issues. You can't win for loosing.



CD

I too had the 0191 code. I took into Carson Dodge in Carson City (after making an appointment that was 10 days to 2 weeks out, I forget exactly, but that was as soon as they said they could look at it) and they checked it out at no charge (1800 miles on truck) and said that the problem "appeared to be operator induced. " That was what it said on the paperwork, but what the tech told me was that he thought I had left the key in the on position for too long without starting the truck. Like I was about to start it and waiting for the light to go out and my cell phone rang or something and instead of completing the start operation, I answered the phone instead and then started the truck. These computers are getting a wee bit too sensitive. I have a fully electronic engine in a big truck and all of the fault codes can be printed on a card maybe slightly bigger than a postcard. A friend works at an International dealership and he showed me his fault code book -- maybe 30 pages long in a binder with nothing more than a listing of all the possible fault numbers and their meaning. According to the Dodge Service Writer, our 2006 CTD trucks have maybe 7 computers in them, any one of which can throw a code that will set the check warning cluster light. Sounds like a cluster to me.

 

[TAbbott]

On edit, I noticed no increase in power or loss of mpg or any change of any kind in the way the truck runs. The light is no longer on and that's the only difference I saw.