Since month I am strugling with the following symptoms:
Car needs about 20 sec of running the starter motor to start if:
- fuel level is between 10 l and 75 l in tank
- car is parked for > 2h on leveled ground
- car is parked for >10 min with front end up (on slope)
Car does start without problems if:
- car is parked with front end down (on slope)
- fuel tank is compleley full or less than 10 l in tank
This has obviously nothing to do with the glow plugs, but with diesel somehow running back and 20sec of running the starter (fuel pump action) needed to get diesel back to the engine.
A BMW dealership here in Cambridge replaced the diesel pump, but this did not cure the problem.
Any advice would be more than welcome! Thanks, Sven