|There is a code P2291. The low pressure seems to be working fine. High pressure only gets to 900 PSI. We already replaced the high pressure pump and there was no change. The customer replaced the fuel filters already to try to fix the problem.|
I did not see any contamination in the fuel. When the engine start, the engine surge and I see on the scan tool the high fuel pressure varies from 17 kilopascal to 42 kilopascal.
Hi Jonathan, Can you run a live pressure test with a gauge? If the ICP connector is full of oil, it will need the sensor and a new pigtail. Have you checked LPOP supply oil pressure? If low pressure pump is not providing properly, the HPOP is being starved.
Glenn, the 6.7 Powerjoke is a normal common rail injection system. No HPOP.
I ordered a diesel fuel pressure gauge (low pressure) and I will check it when I get it. I know that on the scan I can read not low but I'm not sure it's true
Glenn, you should probably check on the vehicle in question, as to how they actually function, before chiming in. This is not the old Ford/Navistar system, and hasn't been for a number of years.
Johnathan there is conflicting info here. You say the rail pressure only gets to 900 psi. However in the next paragraph you say 17-42 kilopascals when running. That is only 2-6 psi. 900 psi and 2-6 psi will not allow this truck to run ever. Good cranking pressure is usually around 2000psi. Idle to WOT is 5000- almost 30,000 psi. Maybe see if you can sort out what the pressure is and get back too…
when he start and run, the engine surge and I can read a variation on pressure between 17 to 42 kilopascal at idle. turn engine off and don't want to start after (crank/no start) and when he do this the fuel pressure don't go higher of 6205 Mpa.
Stop and go back to the basics. Verify proper fuel supply first. There is no place to hook a fuel pressure gauge to the low side. I take a piece of 5/8" heater hose and hook to the high pressure side of the fuel filter. there you can check flow and pressure. This engine does not need much pressure on the low side to start. There is also a low pressure pid on your scan tool, that will toggle from…
Again not sure how the 6205 mpa works. 6205 millipascals is less than 1 psi. 6205 megapascal is 90,000 psi. So still not sure what the pressure is. Might help if you post the actual and desired rail pressure in the same values and stick with one particular value.
You need to prove out the low pressure side is functioning first. Once you know low pressure side is functioning properly, you can follow the diagnostic flow chart for that code. It will lead you through the steps to test the flow control and pressure control solenoids. If you do not come up with anything following the flow chart for that code, run the injector electrical self test. Follow…
Here is a video that may help 6.7 Powerstroke Low Fuel Pressure Problem - YouTube