Hello, I have a problem with my Ducato 3.0 2009 ~ 450,000km.
The car worked well throughout its life, all filters and fluids were replaced on time, refueled only at Orlen.
I did not feel a drop in power despite this course.
At the end of that year, error P0091 started to appear sporadically. The car entered emergency mode. I drove about 10,000 km like this. The error once occurred several times a day, sometimes for a week it did not occur at all.
Then, after replacing all the filters, the car started to enter emergency mode every time I accelerate strongly and I have about 2200-2500 revolutions.
After connecting the Multi Ecu Scan (this is my program for my ducato) and browsing the parameters while driving, I noticed that during acceleration there was a difference between the expected fuel pressure on the rail and the real one. At the expected 1600 bar, it was 1300 bar and when the difference became large enough, the car went into emergency mode or less often it went out completely.
I drove 2000 km because I had to and I decided to replace the fuel filter again and measure the pressure of the pump in the tank.
My pump in the tank is clearly audible and I suspected that it might be giving too little pressure.
We blinded the exit from the fuel filter with a pressure gauge which showed its maximum value of 7bar, so the pressure with the blind pump is higher. Probably the measurement was done wrong, we should plug the pressure gauge into the system and see the pressure during firing. I didn't know it then.
After this exchange and measurement, the car stopped starting. During firing, the pressure on the rail is 80-100 bar, while the expected ~ 300bar. It also does not fire on the cake. We managed to fire when we connected the mother (battery support device) and the starter was spinning like crazy. However, the car went out even when a little gas was pressed while stationary (P0091 or P0092). After unscrewing the bolt during injection and turning, no fuel flows.
I probably have a cp1 pump, only a pressure sensor on the rail and a fuel regulator on the cr pump (probably called a dump valve, mounted on 3 torxes).
I thought that this valve could send all the fuel back to the tank and that is why the CR pump has too little pressure to start. So I plugged the return fuel hose and the car fired (after a while it went out because of too high fuel pressure, which is normal). I replaced this regulator with a new one, but it did not help. The car still does not start, the pressure when firing is 80bar. Interestingly, during the launch, the valve on the pump is about 40% open, I don't know anything about it, but it's a bit strange for me.
I present two videos of the parameters during launch:
https://youtu.be/llpx39O31zw
Firing up during a blind return to the fuel tank:
https://youtu.be/YIfq3gQcNfY
I wonder what to do next. It would be wise to regenerate the CR pump, all injections, replace the sensor on the rail and the pump in the tank, but these are huge costs. I'd rather be diagnosed with this one particular cause.
What do you advise to do?
Should an adaptation of the pressure regulator be done after replacement? I don't see an adaptation option in Multi Ecu Scan.
It is worth measuring the pressure behind the filter correctly by plugging into the system to know what pressure the cr pump gets?
Is it worth connecting an external fuel pump to exclude damage to the pump in the tank?
Is opening the valve to 40% during start-upis normal? from my reasoning it follows that if the opening was minimal, the car would start (it fires when blinded). Maybe it's a problem with controlling the regulator?
Or maybe the pump in the tank should be so strong that despite opening to 40%, the CR pump should get these, for example, 3 bars and fire?
Or maybe the cr pump just fell? Why then it fires during blindness and even gives too much pressure.
Thanks for all the advice.
The car worked well throughout its life, all filters and fluids were replaced on time, refueled only at Orlen.
I did not feel a drop in power despite this course.
At the end of that year, error P0091 started to appear sporadically. The car entered emergency mode. I drove about 10,000 km like this. The error once occurred several times a day, sometimes for a week it did not occur at all.
Then, after replacing all the filters, the car started to enter emergency mode every time I accelerate strongly and I have about 2200-2500 revolutions.
After connecting the Multi Ecu Scan (this is my program for my ducato) and browsing the parameters while driving, I noticed that during acceleration there was a difference between the expected fuel pressure on the rail and the real one. At the expected 1600 bar, it was 1300 bar and when the difference became large enough, the car went into emergency mode or less often it went out completely.
I drove 2000 km because I had to and I decided to replace the fuel filter again and measure the pressure of the pump in the tank.
My pump in the tank is clearly audible and I suspected that it might be giving too little pressure.
We blinded the exit from the fuel filter with a pressure gauge which showed its maximum value of 7bar, so the pressure with the blind pump is higher. Probably the measurement was done wrong, we should plug the pressure gauge into the system and see the pressure during firing. I didn't know it then.
After this exchange and measurement, the car stopped starting. During firing, the pressure on the rail is 80-100 bar, while the expected ~ 300bar. It also does not fire on the cake. We managed to fire when we connected the mother (battery support device) and the starter was spinning like crazy. However, the car went out even when a little gas was pressed while stationary (P0091 or P0092). After unscrewing the bolt during injection and turning, no fuel flows.
I probably have a cp1 pump, only a pressure sensor on the rail and a fuel regulator on the cr pump (probably called a dump valve, mounted on 3 torxes).
I thought that this valve could send all the fuel back to the tank and that is why the CR pump has too little pressure to start. So I plugged the return fuel hose and the car fired (after a while it went out because of too high fuel pressure, which is normal). I replaced this regulator with a new one, but it did not help. The car still does not start, the pressure when firing is 80bar. Interestingly, during the launch, the valve on the pump is about 40% open, I don't know anything about it, but it's a bit strange for me.
I present two videos of the parameters during launch:
https://youtu.be/llpx39O31zw
Firing up during a blind return to the fuel tank:
https://youtu.be/YIfq3gQcNfY
I wonder what to do next. It would be wise to regenerate the CR pump, all injections, replace the sensor on the rail and the pump in the tank, but these are huge costs. I'd rather be diagnosed with this one particular cause.
What do you advise to do?
Should an adaptation of the pressure regulator be done after replacement? I don't see an adaptation option in Multi Ecu Scan.
It is worth measuring the pressure behind the filter correctly by plugging into the system to know what pressure the cr pump gets?
Is it worth connecting an external fuel pump to exclude damage to the pump in the tank?
Is opening the valve to 40% during start-upis normal? from my reasoning it follows that if the opening was minimal, the car would start (it fires when blinded). Maybe it's a problem with controlling the regulator?
Or maybe the pump in the tank should be so strong that despite opening to 40%, the CR pump should get these, for example, 3 bars and fire?
Or maybe the cr pump just fell? Why then it fires during blindness and even gives too much pressure.
Thanks for all the advice.
