Hi all. I recently ran into some issues regarding my 3.0tdi. Car turned off by it self, and wouldnt turn on again. I managed to get it started and read fault codes, which to my surprise, there was low fuel rail pressure. The car ran fine for about 2 days, and then did the same again, this time i just couldnt get it to start for about 2 days. I checked fuses and relays, ran a scan for fault codes, and none of it came out with any faults. I then managed to get the car started once again, and let it idle for about 4 hours outside my garage. Since i couldnt find any issues, i decided to take the car for a spin, and it died on me on the highway. Issue is, when it dies, it cuts the fuel supply, which i managed to track down to 1 thing. Whenever it fails, the ECU refuses to send a signal to start the in tank transfer pump. I checked all fuses, relays, pressure sensor, HPFP and so on, i even measured the outputs on the wires. If i manually activate the transfer pump with the OBD tester, the pump runs completely fine, no issues at all, pumps out the right amount of fuel, runs till i stop it again. I went as far as checking water temperature sensor, which i read could be the culprit(very unlikely i know), tested the crank postion sensor, cam position sensor, fuel relieve valve, high pressure fuel regulater, and wiring for all the sensors aswell. I checked all ground points, both below the car, in the drivers side near the footwell, in the engine bay, in the trunk. Battery is good, voltage is good, no fuel pipes are leaking or sucking air. WHat do i have left to check? Something tells the ECU not to activate the pump, and the thing that does that is intermittent. HELP
Reply With Quote
Bookmarks