I'm looking for suggestions of all places to look for a fuel leak. I park on a concrete slab, with no drips.

I have already mopped up as much fluid from the valley from recently having all of the injectors replaced. I still need to clean it further with simple green, and stuff white paper towel in the valley so I can really know if there is a leak.

3 years ago I replaced the water drain valve o rings, but I suppose they could have gone bad again.

 

Could be...

1) the drain valve o-rings again, or
2) the passenger side fuel line where it is clamped to the head in the valley, or
3) any of the other o-ring seals on the fuel bowl assembly.

 

4) Residual from what's in there/been

 

If the odor just showed up after having been eliminated 3 years ago with the new drain valve o-rings, it's probably not "what's been there".

 

" have already mopped up as much fluid from the valley from recently having all of the injectors replaced. "

 

Good catch, timmyboy76... I read through (skimmed through) too quickly!

 

Check your coolant for fuel. Fresh fuel smell was my first indicator that I had cracked injector cups which were filling my coolant with fuel.

 

I don't always smell fuel in the cab, but when I do, it's usually after replacing my fuel filter and didn't get the square O ring in right.

 

As good as you are, I didn't think you could get a square oring top seal in wrong.