Possible fuel leak

[jfp3205]

Ok, over the last couple of days, I have replaced the o-rings in the return lines on the drivers side, the last one being the one in the rear on the drivers side this afternoon. I did not notice a lot of fuel leaking but was not sure. After the truck sat in my driveway tonight for about an hour and a half, i noticed fluid drips coming off the exhuast crossover pipe under the oilpan. It appears to be diesel fuel.

I crawled under the truck and noticed the bottom of the engine around the starter and the flywheel cover was wet with fuel but it did not seems to be leaking down the outside of the block. Could this just be residual fuel from the return lines or could there be another fuel line leaking on the back of the engine where I cannot see.
Thanks

 

[franklin2]

There is a return line that runs down the back of the engine. The line can also leak coming out of the rear of the injection pump, and run down the center of the engine and drip down the back bellhousing area.