I have 1999 F250 that has a leak underneath. After the truck engine runs for a couple minutes the leak starts. I crawled under the truck and found a piece of tubing with the diesel dripping our of the end. It looks like there may have been a tube attached to that tubing, but I can't find where. Can anyone help me?

 

Check your lines

 

Water separator off the fuel bowl... The new ULSD eats the O-rings up... You can buy a new separator from ford or just the o-rings online if you want to rebuild it.


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check your drian valve when you change the fuel filter you need to drain the fuel it my not be close all the way. mine is behind my fuel filter on top.

 

The drain bowl valve may need replaced. I had a similar leak but mine was when I shut down and it sat for a little while. Once I changed the drain valve ($56 from the dealer) no more leak. At least not that I have seen.

 

If the o rings were gone it would most likely leak down back of block dripping from tube sounds more like valve is open but could be wrong

 

like others have said already, it is the water separator valve on the fuel filter bowl. The part is about $40 if you go to an autovalue store, or a little more if you are a die hard Ford guy and buy everything from the dealership. Fairly simple part to swap out, just a touch messy with all the diesel that will leak out when doing it. LOL

 

Go to dieselorings.com and only do the job once! Hes got the best of the best orings.

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mine was leaking real bad, got new water separator gaskets from RiffRaffDiesel fixed everything dry as a bone now.....at least where it needs to be dry.

Fluorosilicone Drain Valve Orings Set - Riffraff Diesel Performance

Complete Fuel Bowl Seal Kit 99-03 - Riffraff Diesel Performance

he also has a really good write up on how to do it.