for the last two weeks i've been diagnosing a fuel leak in my valley, and found put it was leaking from 3 different spots
1. right fuel hose under turbo had small hole
2. fuel filter sensor under the fuel bowl
3. left fuel hose under dp bolt to motor
and over those weeks i had the fuel bowl out about a dozen times
what help me alot was to remove the fuel bowl, and clean it with brake cleaner, make sure its spotless, and clean up the engine valley by soaking up the fuel with a bunch of paper towels or rags, just make sure its dry, then reinstall it, fire it up and let it idle for a while and try to see where its leaking from (front/middle/rear of valley) and drive it for about 10-15 miles, then strip it down again and see what has diesel fuel on it, this is how i found out my sensor was leaking, its a time consuming process, but it will definitely pin point where you are leakin from i'll post some pics up sometime this week to help illustrate
1. right fuel hose under turbo had small hole
2. fuel filter sensor under the fuel bowl
3. left fuel hose under dp bolt to motor
and over those weeks i had the fuel bowl out about a dozen times
what help me alot was to remove the fuel bowl, and clean it with brake cleaner, make sure its spotless, and clean up the engine valley by soaking up the fuel with a bunch of paper towels or rags, just make sure its dry, then reinstall it, fire it up and let it idle for a while and try to see where its leaking from (front/middle/rear of valley) and drive it for about 10-15 miles, then strip it down again and see what has diesel fuel on it, this is how i found out my sensor was leaking, its a time consuming process, but it will definitely pin point where you are leakin from i'll post some pics up sometime this week to help illustrate