Hello. I own a D3 4.2FSI 2007 year. There is a problem at the moment Low fuel pressure is the problem at the moment. I replaced both sides of the HPFP not with new ones, but from a running car. New fuel filter OE new G410 sensor OE. The problem is this. That the car won't start. I turn on the ignition, the starter spins engine grancks but nothing happens. If I turn the ignition 5 times and wait for the rear pumps to advance the fuel, then it starts.And if it works, it works. Can be driven and pedaled. Just starting the car. Feelings like HPFP produce pressure but it is lost in the return flow. I have also communicated with the engine men here and they think that Fuel pressure regulator. Idle speed control. Valve 06D130757C in the picture Part Nr-26. Is the problem..that its stuck open and releases tehe pressure. Can someone comment??







000135 - Fuel Rail/System Pressure
P0087 - 002 - Too Low - Intermittent - MIL ON
Freeze Frame:
Fault Status: 10100010
Fault Priority: 0
Fault Frequency: 35
Reset counter: 255
Mileage: 408661 km
Time Indication: 0
Date: 2024.08.14
Time: 13:54:00

Freeze Frame:
RPM: 1176 /min
Load: 49.8 %
Speed: 0.0 km/h
Temperature: 21.0 C
Temperature: 24.0 C
Absolute Pres.: 1000.0 mbar
Voltage: 13.462 V

000135 - Fuel Rail/System Pressure
P0087 - 008 - Too Low
Freeze Frame:
Fault Status: 01101000
Fault Priority: 0
Fault Frequency: 1
Reset counter: 255
Mileage: 408699 km
Time Indication: 0
Date: 2024.08.14
Time: 14:52:04

Freeze Frame:
RPM: 2304 /min
Load: 72.1 %
Speed: 43.0 km/h
Temperature: 103.0 C
Temperature: 59.0 C
Absolute Pres.: 1000.0 mbar
Voltage: 13.970 V

 

Cheers. I see that no one has had experience. The fault was in the LPFP pumps. And in the pipe that connects both pumps. Was in the crack and let the pressure into the tank. New Hitachi pumps and the thing works.