The engine code P0193 suggests that the fuel rail pressure sensor is receiving a high input. This issue can stem from a defective sensor, wiring complications, or fuel pump malfunctions, resulting in incorrect fuel pressure measurements and potential performance problems.
It is the high temp and the high return Pressure inside the injector that causes the fuel To turn black
Drivers side just Behind the Fuel Filter
The lift pump on a 6.7L only runs at around 10 psi. The fuel rail pressure on the other hand can be as high as 20,000 psi.
Restricted fuel return line or a faulty fuel pressure regulator.
The usually have 5000 to 7000 psi at start up.
On the driver side of the engine behind the fuel filter on the side of the block
A failed lift pump ( very common ) or a leak/break in a fuel line.
P0452 indicates that the Fuel Tank Pressure(FTP) sensor circuit has low input voltage on that circuit. Possible causes: Fuel tank pressure (FTP) sensor completely submerged in liquid fuel. Inside contamination of the electrical connector on the FTP sensor. FTP short to SIG RTN or PWR GND. Damaged FTP sensor. Damaged PCM.
probably fuel pump.
On the fuel filter!
Lift pump pressure is only about 10 psi. Cummins actually does not put a spec on it. They put a spec on how much volume the pump is putting out. Should be more that 500ml in 30 seconds. The high pressure side of the system will vary from 5000 psi to 20,000 psi.