ISL9 330 CM2350

[mayhem1]

16 Freightliner with ISL9 330 CPL 4525 engine CM2350 came in on hook with fuel tank loaded with water. Almost pure water, a lot of it, not engine coolant. Enough that someone would have to have intentionally done this. 10 other trucks use main fuel supply and no other trucks are having issues. Drained tank completely, changed filters, and blew lines out. It ran good about half day and code 559 came up. Would not build fuel pressure, so replaced fuel pump assy. I had checked relief valve and sensor, even stuck a "test" one in to make sure. Did pressure test and was good. 29,200 lbs and dropped maybe 1000 in 5 minutes. Did injector test showed two that would not pass test point 1. So replaced all 6 because of all the water that had been through it. Passed leak test and injector test, but when test drive it almost immediately goes to code 559. Did another leak test and was fine, but did another injector test and two of the new one failed point 1. 2 out of 6 Cummins injectors bad? Or did water damage head? Fuel pressures are steady when comparing commanded vs measured.