I own a 1996 Chevy Suburban K2500. 3/4 Ton 4x4 with the 6.5 Turbo Diesel. It's @ about 150k so got lots of life left. I hope.

I decided to do head gaskets as I was losing little bits of coolant off the back of the block. I'll be pulling a trailer cross country this summer so I figured I should resolve that issue. I did the whole operation took it apart cleaned stuff up, put it back together. It took about 6 tries of serious cranking before it even coughed and started. Once going it was running rather rough comparatively, the oil pressure was low (usually pinned @ 40; was anywhere from half this down to 0) as well as voltage(bout 11 or 12 volts instead of 14). After starting a few more times running on different days the voltage and oil pressure seem to have figured itself out. I chalk this up to the ecm/pcm etc. getting situated since the battery cables were dropped for such a long period.

THE PROBLEM: The truck will still start and idles about where it usually does (about 700 rpm) but is still rather rough and most importantly I am dripping clean fuel at an alarming rate from the rear of the engine while running. My first thought of course would be fuel delivery: Injector pump/lines, fuel filter... OR perhaps I didnt get the headbolts tight enough around cylinder #8. Everything is clean and dry. I have followed the fuel lines from the pump under the driver side frame rail to the filter; the valley is dry so it's not between the filter and injector pump or the injector lines. It's not the injectors I would see the fuel coming down the side of the block. The only place there is fuel (and obviously the only places that are wet running or off) is the lower bell housing/pan covering the flywheel and torque converter. Fuel is dripping out of a drill hole in the bottom of the pan, and is running down the sides. The pan, the starter, rear seal (oil pan) and the oil filter housing are the ONLY wet areas. EVERYTHING above (block, heads, fuel delivery) is bone dry. I have looked at everything short of tearing the motor apart again.

Also no SES light which tells me there is no electronic issue so (obviously) we have a mechanical problem.

Confused and out of ideas. Any help would be greatly appreciated; the sooner the better- this is (or 'was' until resolved) my daily driver.~Z

 

Learned of drain hole drilled into valley and sure enough that's what routed the fuel to the bottom of engine... Had to run vehicle and look directly down between air intake to see fuel; apparently it dissipated quickly after shut off which would explain why I didn't see it before. Cleaned all the crap out of there.

I have real slow drip from bottom of fuel filter canister. I'm thinking/hoping O-ring? Anyone know if this just uses a generic O-ring of correct size? I can't find anything pertaining to the fuel filter housings on any of the auto parts stores' sites. Dealer only? (I also have never had the metal ring that holds the metal style fuel filter in place; it had the threaded plastic type when I bought it so I've always had to buy that style)

The fast flood is coming from the injection pump end of things. I'm hoping i just need to tighten an injector line or hose clamp and it's not a serious mechanical issue as I just replaced the IP within the last 2 years...