Does anyone know the max value that the pressure sensor on the fuel rail can read on the '08 6.4L diesel. i.e. 5v out = what pressure?

Thanks

 

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From my experience, I am not a Ford Tech, but a Deere (John Deere) Tech, we use these new fuel systems and are running Tier III engines (super emission controls), a 5 volt out signal from the sensor would cause a circuit fault and the truck probalby wont run... if you are thinking of jumping the sensor, we have had some people try this and just ends bad causing the engine to run very poorly and wont go more than an idle. I am just speaking from my experience but a HPCR engine knows a desired and absolute pressure and they have to be within a certain range for the engine to run right. This causes a problem if you modify the sensor voltage to read higher than the engine wants to see.

I know I am going on assuming that you are trying to get more power. Our engines run about 25,000 psi fuel rail pressure under a full load. So that would probably be around 4.5 volts which is usualy the max range for a 5 volt sensor system.

 

I'm not trying to modify the system. What I'm looking for is the rated full scale range of the pressure sensor. Is that 25,000 PSI?

 

It could be a lot higher than that I guess since you could increase the pressure it just depends on how much they wanted their sensor to read. Thats just my guess too, I dont know for sure what Fords spec for rail pressure is.

 

around 25 or 26k psi is normal under full load.