by any chance is this a fuel return line. i really wish i had a picture of this to look at. can you take a pic. and post it?

 

Yeah, I guess a picture would be easier! Here is a picture. I have circled the outlet in question (one with a question mark) I have labeled the other outlet and line with what I think they are. Let me know if this rings any bells for anyone. Thanks.

Carb pic

 

In case you can't make out the text, the outlet on the top I believe is the choke overflow/vent outlet. The second outlet from the top is the one I am questioning. The yellowish hose at the bottom is the transmission overflow line that comes up from the tranny.

 

the hole in front is for a vent line for 100% sure.

 

When you say "the one in front" are you referring to the one at the top of my picture? If so, I agree, I believe that is supposed to be connected via a T-fitting to the vent line coming off of the bowl and two then vented into the frame. The one I am unsure of is the brass one at the bottom of my picture which is circled. I don't think that is a vent line.

 

the brass fitting by the mouth of the carb(by your trans. line) is a vent line. i still think that the black fitting in the picture circled is supposed to be a blocked off port or it has to hook to a vacume line.

 

Really? Okay, I will try that. But why would they put an inlet that needed to be blocked off? I would think that if there is a hose fitting on it, it would take a hose. I will try blocking off the black one and see if that works. All the pictures I have seem to show the black fitting being connected via a T-fitting to the vent line from the bowl on the bottom.

 

its too big for a vent line. the small brass fitting in front would maybe hooked to a "t". sometimes carb. bodies are made for differnt applications where the fitting might be used. hopefully some who reads this has a xplorer to look at or has first hand knowledge of this line. good luck.

 

I tried blocking off the black outlet and using the brass one as a vent and got nothing.

When you say "its too big for a vent line" actually the black plastic outlet is the same size or smaller than the brass one. I think the picture distorts the size. The black plastic outlet at the top of the picture has a small 90 degree elbow where it tapers down to a very small opening (no bigger than 1/8" ID tubing.

 

Anybody out there got a 250, 300 or 325 Trailblazer, Xplorer or Xpress? If so, can you tell me what your carb looks like? I believe they are all the same.