While tuning a 2007 Avalanche with the 5.3 LC9 and Magnacharger and a BIG Comp LSR cam, I needed to make a few adjustments to the Injector Delta Pressure table. So I added the PID's for "Inj Delta Pressure" and "Fuel Pressure (SAE)" to my table display in the VCM Scanner (2.25). I can see the Inj Delta Pressure value changing based on MAP sensor loading changes (which is normal), while the Fuel Pressure (SAE) remains fixed at 399.0 kPa (4 bar). Maybe the fuel pressure is regulated so well the it never does change, unless the demand out-strips the supply. I don't know. So I decided to check on where the Fuel Pressure sensor is located in this truck and based on the VIN, the parts search only shows a "Fuel Tank Pressure Sensor". I did the same parts search for my 2012 Corvette based on its VIN and also found the same thing ... only a "Fuel Tank Pressure Sensor". No Fuel Pressure Sensor at all !!
I did find a Fuel Pressure Sensor on a 2011 GMC 1/2Ton Pickup with the 9.2(2) L9H engine, so GM is building vehicles with a Fuel Tank Pressure sensor AND Fuel Pressure Sensor. But since many of the vehicles we work on seem to only have a Fuel Tank Pressure Sensor, how in the world does the "Fuel Pressure (SAE)" PID get its data, when there is no Fuel Pressure Sensor in the system?
I am also in the midst of an engine swap project with a 2013 Corvette LS3 in a Street Rod (non emiss) and was planning on not using the Fuel Tank Pressure sensor; disabling the appropriate DTC's for this sensor. But, will I end up with issues related to the Fuel Pressure PID and how the E38 ECM calculates the Inj Delta Pressure value?