Fuel Leak?
 

My wife just got back with the truck and I smell a strong odor of diesel fuel. Look under the truck and see fuel dripping down. Fire it up and see fuel squirting out of a pin hole. It appears to be coming from a hose behind the water sep fuel filter. What size is that hose and what would be the easiest way to replace it. Thanks for the help.

The hose is 5/16" by about 2 foot long.
It's hose clamped on each end.
Best to remove the filter for better access but most of the job is by feel only.
The rear end of the hose is way down there and tight, it will leave scars but can be done from the top.

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Awesome!! Thanks for the schematic too.