Had a 6.0L with 195,000 miles and the engine almost died but not quite. You can ride it a little longer. Two lean fault codes on both engine banks. The fuel pressure was checked and it was very erratic and fluctuated rapidly - from 30 to 50psi. Replacing the fuel pressure regulator in the rail did not change anything. The fuel pump was definitely the culprit. Now with a new regulator, pump and filter the idle reading is 50psi. Works great, not in bad condition anymore. Hope this helps someone else.
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