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I am having problems stalling out due to starving for fuel after running a few hours smoothly. I have a new PMD, new fuel pump, new fuel filter, but when it stalls out, fuel is not getting to filter canister. There are no obstructions in the tank, and the PMD has been relocated. The truck will restart when it cools down - maybe 15 - 20 minutes later.
I am having problems stalling out due to starving for fuel after running a few hours smoothly. I have a new PMD, new fuel pump, new fuel filter, but when it stalls out, fuel is not getting to filter canister. There are no obstructions in the tank, and the PMD has been relocated. The truck will restart when it cools down - maybe 15 - 20 minutes later.
I drove a 6.5 for a number of years. I would still suspect a malfunctioning PMD. Does the engine give any indication that it is starving for fuel before dying (engine missing, sputtering, etc.) or does it just suddenly die? If it is the latter, it probably is the PMD. If not, it may still have an issue with the fuel supply pump or it may have a bad fuel line allowing air to get into the system somewhere.
Though I doubt it is the problem that you are having, the injection pump can also have a problem. The injection pump on the 6.5 is pretty robust, but it does not behave well if it has been overheated. In fact, the biggest weakness of the 6.5 (other than being pretty gutless compared to current model diesels) is that the whole engine is pretty intolerant of overheating. Unfortunately, many 6.5 drivers overtaxed the engine with heavy towing, etc. which would overheat them. Once overheated, a 6.5 was often never quite the same and would have frequent problems. The 6.5 that I had lived well, but it was never used to tow anything very big, and only towed very seldom, at that.
Yes the fuel sputters and misses and just slowly comes to a stop before stalling. As any diesel does, when lacking sufficient fuel. The fuel supply pump is brand new.... I don't think its a bad fuel line because it runs fine for days sometimes. But always has the issue after the truck is warm. Each time the issue occurs, I took the top off the filter canister and noticed that there is very little or no fuel in the canister. Even if I turn the key forward and hear the pump run, very little fuel goes into the canister. When this issue does not happen, the pump fills the canister very quickly.
Having said that, all of this began three days after I completely ran the truck out of fuel.....
With that description, I suspect that you have an air pocket in the fuel system somewhere between the tank and the fuel injection pump, possibly caused by running the system out of fuel or by a loose connection in the fuel system somewhere that is allowing air to get into the fuel line.
My dad just replaced his third injection pump on his 96 6.5L. You may want to have someone check it to be safe. He finally fixed and sold that thing and went to an 04 Duramax. He has had tons of issues with it.
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