94 Blazer with 4.3l -Fuel dripping from tail pipe
 

It's been intermittently running rough, then finally wouldn't start. The plugs were clean and wire relatively new. I replaced the distributor cap and rotor, replaced the fuel filter and checked the EGR valve. It'll start now, but raw fuel is dripping out of the tail pipe. I tripped the codes on the dash and there weren't any present. Any ideas what I can do to solve the potential "Molotov" Chevy?

1. Fuel Leaking From CPI (injector), FPR ( Fuel pressure Regulator on side of injector), Nut Kit ( Hoses that go from metal Fuel Lines into the plenum "upper intake" into the injector), any of these will leak fuel into the upper intake called a plenum.

2. Cracks in the heads / valves or stuck open valve

Diagnostics and tell tale signs:
What is The fuel pressure idling/running?
What is the fuel pressure with key on but not started?
How fast/slow does teh pressure leak off with key on but not started?
Is The plugs wet?
Is gas in The oil?
Is The Oil overfilled after running the truck a while?

I had and am having same issue/symptoms so I have done gone through much of this.

Insert profanity here _______.
 

There is in fact, gasoline in the crank case. Apparently, not something caused by a sensor issue. Cracked head?

yeaaaaaaaa looks like it...You have a job cut out for ya..

#1 from JR's post is the MOST COMMON failure for the CPI engines & can result in both raw fuel out the tail pipe as well as fuel in the crankcase. Start there before jumping to deeper things. A compression check & leak down test can be done to assess the condition of the rings/pistons/headgasket/heads/valves/etc.

What I learned is from Blazer forums Here and Man has This been the Largest wealth of Knowledge I ever seen

Renewed optimism
 

I'll check the CPI, FPR and nut kit for leaks. The vehicle isn't worth tearing the engine down for anything major. Thanks guys for the tips and help. -J.R., you rock! I expect I'll be back to Blazer Forums when I have it apart.

Behold!
 

Hats off to J.R. I took the plenum off and found a hose n clamp repair from the inlet to the CPI had backed off the barb. A simple fix compared to any other scenario. God willing, after the oil replacement and a double check I've got all my hoses and sensors reconnected, it'll start and be the reliable Chevy I've been able to count on.