I’ve been battling an 01 5.3l lm7 with flooding issues for a month now and I’ve done everything I can think to fix it but it’s still puffing white smoke and raw fuel out the tailpipe. So far I’ve checked fuel pressure and it’s running 58psi, changed the head gaskets because no 3 cyl had an issue, changed the injectors with brand new injectors, ohm’d out al of the injector wires from pcm pin to injector conntector pin and everything ohms great, put in new plugs and wires drove it few miles and still smoking so I pulled all of the plugs every cylinder except cyl 3 is burning clean cyl 3 is saturated with fuel, I checked for codes and the only code I keep getting is p200 injector circuit fault code, I have up tuners and another 01 0411 pcm at my shop but I don’t want to swap the pcm and spend the licenses on it if that may not be the problem. Can someone please help me figure out what could be the cause of this it’s my moms only transportation and she really needs her truck back.

So the problem is cyl 3, according to your post.

Did you pull the injector connector and run the truck and the smoking stopped?

Cyl 3 coil plugged in and firing?

New injectors same size as old ones?

the injectors are always powered, the PCM grounds them to fire them. Maybe cyl3 has some chaffing and made its way to ground. Run a new ground from inj connector to PCM if you think that's the problem

yeah cyl 3 is the issue I’ve changed the connector and also ran a new trigger wire from the pcm to the injector connector, tested the ignition and cyl 3 is firing, I unplugged the injector while it’s running and it still smokes and the injectors are direct replacements for the old ones same flow, same size and same p/n

Move the injector and see if the problem follows it

i did that and nothing changed still runs the same.