Try putting 2 quarts more oil in as sometimes the pick up pipe for the injector oil pump can draw in air cos of cracking .if it works then its crossmember and oil pan off time the rest will be plain to a good tech.
Also the rail oil pressure sensor can go funny - find the big plug and socket of wires by the dipstick handle ,going into the engine they are all pink but on the other side of the plug and socket is one wire that was white might be a bit yellow now - pull that out and try for start - fools the ECU into thinking that oil pressure is ok to fire the injectors .If it runs then its new sensor time .
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