Gas leaking from carb from ports alongside valve choke
IÂve been trying the last three days to fix my lawn mower. I have a Craftsman Rotary Lawn Mower Model Number 944.367742, B&S 4cycle engine Model Number 126T05-0880-B2.
Mower is 2 years old and has 15 hrs of running time. 10 hrs last yr, 5 this year so far. Machine ran great until last week. Here is the Parts PDF Page 3 shows the exploded diagram, this engine has the Auto Choke.
The problem: Gas leaking out of carb while engine is not running. Gas trickling from ports on either side of the Valve Choke (#108).
What I've done so far: Removed air filter, float bowl, carb float, valve needle and seat. Checked for obstructions, none but cleaned it anyway. Replaced all parts. Reattached gas line. Once the float bowl fills up, gas continues to pour out of the two ports. When I first disassembled, the needle seat pretty much fell out. When I reassembled, I pushed it up as far as it could go. Wondering if I pushed it up too far, I installed the needle and the carb float. Leaving the float bowl off, I reattached the gas line. Without applying upward pressure to the carb bowl, gas flows down the needle, as it should.
When I apply light upward pressure on the carb float, I can feel the needle seat itself up against the seat, when that happens the gas stops flowing. So I assume its working ok. I reassemble everything and start the mower. After priming itself, it chugs to a start then works ok. Ran for about 1 min. No leaks. I leave the mower and come back 30 minutes later and gas is again pouring out of the carb, from the two ports on either side of the Value Choke. Definitely out of the port on the left, and seemingly out of the right port too.
Question: What could be the problem? I don't know much about small engines other than knowing the problem has to be air, gas or spark. It gets air, fresh gas and a new spark plug was bought to eliminate that issue.
Thanks for your help in advance.