1999 5.7 Vortec problem

[Seppl]

Hi guys.
Got following problem with my 5.7 vortec.
Started fine, drove out of driveway and she started back firing and smoking really bad, no power.
The fuel tank was a quarter full, by the time I limped it back into yard, fuel tank was empty.
Oil dipstick is 4 to 5 inches overfull now.
So I'm guessing the fuel went into the cranking case.
I'm guessing Piston rings are gone, or is there someway else the fuel can get into the oil ?

 

[OR VietVet]

Strange that numerous piston rings went bad at same time. Do a compression test but may be pretty bad with failed compression rings. Any recent fuel system or engine work?

 

[Seppl]

Only new cap ,rotor, sparkplugs and wires. Was going to change fuel pressure regulator and spider injectors.
Fuel pressure went right away to zero as soon as pump shut off.