I have a 1999 GMC K2500 suburban and the fuel filter housing has a LEAK in it. It is not the O-Ring on the cover. The cover is screwed on tight. The bleeder is closed. And all of the fuel lines are clean and dry.

It is a substantial leak from the lower side. I think there is a primer pump and a warmer down there. I see the housing on line for $600. Is there a rebuild kit or an aftermarket filter assembly that a working man can afford? I am in florida and don't need a diesel warmer.

it could be the lower oring on the heater assy or the water in fuel probe.

i finally said screw it and replaced my fuelfilter with one from northern tool.
it is see through so i can see how much water is in it.

another problem i had was a hole in the bottom of the cast aluminum from all of the crud that had accumulated from the po not cleaning the unit properly.

wes in houston, tx
getting ready for the rain from alex.

Yeah.... if I had to guess it would probably be coming from the fuel filter heater o-ring. I had that problem last year and it sucked until I fixed it lol. Not saying for sure that is where yours is coming from, but it seems somewhat common for it to leak there.