Starting issues after power washing the engine

First of all, listen if the fuel pump runs for two seconds after you first turn the key to run, before you turn the key to start. If the fuel pump does not run check the fuse #56 in the battery junction box. If the fuse is good, try a new fuel pump relay also in that BJB.
If the fuel ump does run, perhaps it is an ignition problem, so either check for a spark or just see if the engine will start with a couple shots of starting fluid into the throttle opening then quickly make it to the key and try to start the engine.

Very common on these is fuel pumps and fuel pump driver modules. Usually at 100,000 to 120,000 miles.