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Message: [QUOTE="96F350KID, post: 1411362, member: 1608"] Wonderfully a customer has brought in a 2012 F250 6.7 full ******s 66,000 miles with a stalling issue as well as a crank no start when hot. First thing we did was duplicate the symptoms and found warm the truck will only produce 4,099 PSI of rail pressure when cranking. Once started and driving the "tow" tune would command 38,000 psi of rail pressure. Next the procedure is to take a fuel sample. Pulled the rail sensor on the driver side and cycled the key. The truck pumped out what is pictured, quite a bit of metal. Ford states when this happens to check for water in the fuel. Here is the interesting part. There is no water in the entire tank, we dropped it and put all the fuel into clear 5 gallon water jugs. It had 15 gallons when it came in. None of the sensors had any rust on them none of the fuel lines or FCA were rusty. The particular tuner used on this truck is the same tuner we have had 6.4 and other 6.7s come in with fuel system failures. We determined after much poking and playing without taking it down the extreme high rail pressure is what caused the pump to kill itself. I won't disclose which tuner is on the truck due to bickering and complaining. I will say the tunes are not flashed using a SCT Device. As i stated earlier this is not the first time this particular tuner has been attached to a truck that has fuel system failure. All trucks with it have been older adult owned vehicles on strictly the tow or stock *** off tunes without many miles at all. I will advise anyone out there with my own opinion to verify how much rail pressure their tuning is using. This particular truck sounded like a rattle box and the customer thought it was "How a diesel should sound" with everything removed. My personal 2015 is tuned and still runs like a stock quiet truck. What are your thoughts? I wouldn't have made this post if it didn't seem like it is a pattern. Now I'm well aware of the fuel system issues the early 6.7s already had but as far as this truck I don't see it being related to that issue, maybe we're wrong. But none the less the vehicle needs a new fuel system and is switching to a different tuner. We're gonna pop open the HPFP before we send it back to have a look. P.S I tried to take a good picture of the fuel sample but I can't get the lighting correct but you can see a few of the flakes in it. :ford: [/QUOTE]