Fuel pump failure

[Yauchout]

Just curious if anybody has any ideas why the pump failed? The pump was rebuilt with new plungers and rollers around 130,000 mi ago Give or take I had no warnings leading up to the pump failure. The truck ran fine. No engine lights was just in the left lane doing about 70 and it was like somebody shut the key off that goes to the side of the interstate. Have fuel pouring out from underneath the truck. Roll the hood over and the pump head that is separated from the pump body. All four bolts sheared at the top of the pump body. The only thing I can figure from my own thoughts is the pump head bolts should have been replaced. The truck has 1.2 million mi on it. The pump's been rebuilt three times and those are the original bolts. What you're seeing in the top of the right hand roller is some dirt and grease from trying to get it out. Not parts of the plunger, although the front plunger did shear I don't know if it broke previous to the head separating or if the head separating caused it to break but it is a clean break