I just put in a rebuilt motor. it didnt fire up initally. Turned out #4 fuel line was leaking like a seive. i replaced it with a new one from Cummins. only $24!! Dealer wanted $70! The new one has a all metal bracket and it looks pretty beefy. The engine fired up right away and was doing great for the first 5 mins. Then I started to see a pretty good fuel leak that was dripping down the tranny/ engine junction. #4 looks dry and I cant see a fuel leak from the CR. I have not checked the injectors that came with the motor ( that was going to be my next step after I got the install done). i did see a coupe of little drops going down one of the lines next to the fuel filter but not the leak that i saw earlier.

My question is this:
Is it possible it is a stuck injector and that there is a high return flow that is leaking somewhere? There was a delayed return to idle when you gave it a little fuel.
What should I do next??
Any constructive thoughts would be helpful . It has been 4 months with no truck and I would love to see her purr again

 

Did you check the fuel return on the back of the head?

 

leak is most likely on the low pressure side, since a leak on the high side would cause a no start or the fuel would be misting,

 

Where do I find the return hose? Do I need to crawl up under the hood to find it? Is it safe to drive it to the dealer leaking?

 

It is on the very back of the head. I you have injector leak due to a bad injector or crossover tube seal, this will return the fuel to the tank. It's a banjo bolt on the back of the head. They may have left a copper washer off.
It's not the PRV valve on the rail.

 

Here is a picture if I can get it to post. See it at the back of the engine.

 

Little better pic.

 

Thanx for the picture! turned out the #6 fuel line was the culprit. Now no more leaks. dNow I am just puffing lots of blue smoke Not sure what to make of this yet. Truck runs great ( or so it seems). no error codes. Any ideas? Head was rebuilt and I was told new rings were placed.

 

Check your turbo's seals. I would also call the folks who rebuilt it. Did you install it, or someone else?

 

I had called the guy who rebuilt it., he said he put new bearings in and new rings. i had a guy install the motor for me. how do youcheck the turbo seals??

 

Just pull the air cleaner intake off and look inside at the compressor wheel. To inspect the exhaust side you will need to pull the downpipe off.

 

when i pull off the air cleaner and te downpipe what will i be looking for?

 

Engine oil.....