Hi I have a 2005 with D12 engine it has around 900k miles. Anytime when I turn off the engine and try to restart it under 10 minutes it would stumble and die. But if wait at least half an hour before restarting would start fine and run smoothly. Also the first start of the day always start smoothly without any problem. So it only causing problem if I turn off and restart the engine in less than 10 minutes. When it died the secondary fuel filter would be half empty when I took off to check. I have replaced the overflow valve by the front top of the engine and it didn’t fix the problem.
So my next step should replacing the fuel pump? The fuel filter housing? I have an electric prime pump on fuel filter housing if it makes any difference. Turning the electric prime on didn’t change anything and I still had to wait 30 minutes before I could restart the engine.