honda gx620 carb, im stumped!

gran_pann

gran_pann

Member
#1
#1
Hi everyone, I have a GX620K1 engine (QZB2, GCAD) the 2XXXXXX serial number

I have been trying to figure out what a certain hole in the carb is for and im stumped. I can see the fuel inlet, bowl drain outlet, and then there is this spot at the top that had some cut off hose running to it. I have searched the factory service manual, pictures online, users manual, and there really isnt anything I could find.

I can tell you that when I was cleaning the carb that this top hole goes to the top portion of the carb where the bowl area is (carb cleaner goes through it) but I am truly stumped.

Attached are some pictures of what I am talking about. IMG_0920.JPG honda gx620 fuel line diagram.jpg harness wiring gx620.jpg IMG_0918.JPG
 
gran_pann

gran_pann

Member
#4
#4
I was thinking along those same lines since it's open to the top. So here's the next question, if it's a vent hole, does it allow junk in the engine? What's the best way to handle it?
 
OND

OND

#5
#5
It might have been connected to the air filter system originally, but you could just get a small filter to let it breath and hang it high as you can. Advance Auto Parts has the really small filters.
 
gran_pann

gran_pann

Member
#7
#7
Thanks everybody. If it did attach to the air filter system originally, I'll take a good look at the air filter housing. So far I think that its either a vent for atmospheric pressure to the carb (like that hole in the gx200 carbs has to keep atmospheric pressure in the head-space above the bowl.

AND/OR

an overflow protection vent in case the pump overpowers the needle, allowing fuel to vent, in which case id need to run a few inches of hose to vent it away from the engine.

Ill let you all know how it turns out in a week or two when I get some more stuff in the mail. Thanks so much again!
 
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