06 volvo d12 fuel problem

Have you replaced your overflow valve?

 

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I am having the same exact problem. Except mine has been happening since May. It started while I was sleeping and out of no where, engine shut off. I hand primed it and it ran fine again. Nevertheless, It would shut off if I let it idle for a few hours. (If I'd idle it with the engine revved, using the cruise button, it wouldn't shut off). I've changed the fuel pump, Accesory drive, (after replacing these, the idling problem went away) fuel lines, check valves, filters, hand pump and still have the same issue. I've checked the fuel pressure with a tester and it reads with in spec. However, my truck loses fuel pressure when I shut it off. Has anyone been able to solve this problem? By the way, where can I find #5 diesel?

 

I'm having the same problem, a code popped up saying fuel delivery pressure, I replaced the fuel head filter and the fuel pump and the water separator of which it was dumping coolant into the fuel system, it has been a week and now my water filter is black and slimey. I'm going to get some biocide and go from there. if that doesn't work I'm going to start replacing the fuel lines. I will let ya'll know.

 

Black and slimy is fuel bacteria. I fought this problem all summer in my truck. I bought the 80oz power service brand biocide and used a squirt bottle and on a 75 gallon tank I put at least a couple shot fulls to start. Don't expect it to go away right away either, keep treating with every tank full it may take a few months for it to totally clear up. One more thing stock up on filters your going to need them. When I first started treating the tanks I went through a filter on my Davco every couple thousand miles. I used 1 1/2 80oz bottles in total with me shocking the tanks every month now. Hope this helps.

 

Mine does that what do you think is causing it?