I'm rebuilding the carb for an impossible to start Toro 20331 w/ Briggs 6.75hp engine 126T02-0299-B1. I've got everything cleaned up and shooting cleaning fluid, but the small opening in the picture, the right one, not the one with the brass insert. It appears to feed the large hole on the outside of the carb at the 12 oclock position (not shown). Thing is, I can't confirm this with blowing anything through it. Is this a dead end hole?
Correct! I have gotten it running after figuring out the air choke spring was missing. Problem is, that it occasionally floods gas out the air filter. It was doing this before too. The seat is new and properly installed. It is new along with the needle and float pin. The float is the plastic type where the needle slides into the tabs, there is no adjustment. I did notice that the float pin was pretty loose. I'm guessing there is something fishy going on with the hole float thing not working properly. What could it be? Is there a different float assembly that might be more reliable? After it floods and I blow out the gas out the plug hole, I can get it to start, but that is not going to work for me. I see now why it was rolled out onto the curb. The mower is only 2 years old.
Don't ever remember seeing a float pin problem. Have seen a few floats that had cracks causing them to fill with gas. When the float is installed does is set level with the base of the carb, when the carb is turned upside down. Have seen intermittent problems with dirt getting out the seat causing leaks, even new seats.
Seems the rubber seat material they are using now adays is easy to tear when installed, will swell and cock to the side slightly causing a fuel leak.
I set the seat with the blunt end of a drill bit. Strange that it should leak again with new seat and needle. I will have to pull it out and see if there is anything suspicious. How can one remove the seat without damaging it? For some reason the rebuild kit, which also has extra parts to cover other carb models, included a spare seat. They both looked the same to me at least.
Something that I have done a few times to remove the seat is while holding your hand over the area where the seat to catch it when it comes, blow compressed air in the fuel inlet to pop the seat out.
The difference between the two seats is the size of the center hole in the seat. One has a smaller hole then the other one.
