Returning from a fishing trip the other day I pulled the boat back 200 miles and the 05 6.0L ran fine. The boat pulled a little harder than I thought it should but there was a very strong cross wind.

When I got home I backed the boat in the garage, everything was fine.

After a while I went up to the store (just a few blocks) but the truck sputtered like it was nearly out of gas. Got it home and parked it in the garage.

This morning I went out to start it up and it was hard to start and would not run.
If it did start it quit right away and once coughed up(backfire pop) a bunch of wet sooty substance all over the wall and now the garage is full of smoke

Thought maybe a bad fuel pump, I have 78,000 on the rig. But when I turn the key to the run position I can here the fuel pump run then stop.
I can hear it again after an attempt to start

 

What color is the smoke? Black or white? You have a check engine light on?

 

possibly could be your fpr

 

Blue tint.

I had a check engine light but erased it, it was about cat performance.
I have a set of LT headers and have not turned off the rear O2 sensors.

 

Where is the fpr?

 

the o2s wont be your problem. is your truck an 05 or just the motor an 05

 

05 Suburban 2500

 

blue smoke = oil in the fuel? PCV issues?

 

mine did that when i had bad 02's

 

Have you got the truck started yet?If not have a friend crank the engine over as you hit the bottom of the gas tank with a plastic or rubber mallet.If it starts you need a fuel pump.Clean or replace your PCV valve also.Good luck