Fuel tank vent?
 

Can someone verify the part with the hole in this picture for me? It's on the fuel tank of my 2003 Blazer. I believe it is just a vent.
There are 2 hose barbs on it, but any replacement vent that I can find shows only one hose barb and says it will not fit my vehicle.
If anyone else has replaced this, what did you use? A proper part number would be great, but any help is appreciated.

https://cimg2.ibsrv.net/gimg/blazerf...7fa558679d.jpg

you are correct it is the vent for the tank. my 04 is the same way. its looking like the part is obsolete as is a plastic fuel tank. i have spent 2 days looking and found nothing so far. i am having trouble filling mine and noticed whoever did the pump last pinched the big plastic hose coming off the big nipple. i tried to open it up but im thinking the vent is stuck

Hopefully hes gotten it figured out by now...

Any developments?
 

I’m having the same issue right now. My tank has the two nipple valve and all I can find for replacements is the one nipple valve. Has anybody managed to find a two nipple valve or a method to convert there fuel system to running the one nipple valve ?
https://cimg5.ibsrv.net/gimg/blazerf...4a09dc1ac.jpeg

i got rid of my blazer so its someone elses problem. i cut my valve out and just put plexi glass and with 2 nipples glued into it. good luck my friend. seems no one is caring that much since this thread was started in 09 and no one cared to answer him.