There is a replaceable Viton seat at the bottom of the bore that needs replacing, p/n 631021B. You can remove the old one with a small pick or a shot from an air nozzle into the fuel line barb. Make sure you aim it away from anyone if using the latter method.

Thanks. From what I can see, that needle seat looks ok. Not cracked, or chaffed. If need be, where can I order that part?

Sometimes, when you remove the fuel line, you'll dislodge some crud.
Upon reassembly, this crud gets washed down into the needle/seat, causing it to leak again.
I'd clamp off the fuel line-
Remove float & needle-
Unclamp fuel line and let it "flush" a few seconds, reclamp-
Reinstall carb parts-
Hope-
Upon successful solution, it'd probably be a good idea to change the oil, since some gas has probably seeped into the crank case.

Hi Bill,

I tried your suggestion. Put it all back together and started up the mower, ran for 30 secs, stopped it. Then sat back to stare at the carb to see if it would leak. Waited a few minutes, no leak. Thinking that "maybe" I was successful, I pushed the mower across the driveway (crushed stone) to the storage shed. By the time I got to the storage shed, teh carb was leaking gas.

Back to square one. :(

Jim

Replace your needle and seat.Take a close look at the viton seat one side has a groove and it goes down in the carb,and the smooth side goes up where the needle seats on.The part # above is the number for a tecumseh.If you have a briggs engine the part #is 398188.Hope this helps.

Jerry

Hi Jerry,

Thanks for that.Yes it is a briggs motor, 6.75hp. You're the first one to mention the viton seat having a groove. Everybody else I spoke with (outside this forum) thought the grooves were the problem. The needle and seat look brand new, no build up, no corrison, no cracks upon closer inspection with magnifying glass. Yesterday I had a devil of a time getting it to continue running. When I could get it started, I'd have to remove the entire air filter apparatus. Once it ran, I could put everything back on. As soon as I started walking down a slope on the lawn (+30 deg) the engine died. Took it all apart again and discovered the seat had turned partial around in its position so it wasn't sealing at all. Straightened that out and tried again. This time the mower worked ok. My frustration level was quite high at that time. I was ready to let it roll down the hill into the forest below. =8-#

Jim

Jim

Glad you got it going,this forum,has help me a lot too.

Jerry

Hi there people I have a Ryobi taipan 31cc lawn trimmer. It,s about 11 years old and it has never given me any trouble. Recently I rebuilt the carby and now when I prime it fuel starts leaking heavily out the air intake
Can Anyone tell me what the problem is?
Thanks for any feedback. Much appreciated

IMO or guess probably the same problem the needle not seating on the seat shutting off the gas. when you push the primer buttom it just pushes it pass the needle and seat. If I remember how this works???? when you start the engine after priming (pushing the primer buttom it just circulates gas up and through the carb. but not pass the needle and seat). once the engine starts or enough vacuum pulls the needle off the seat so gas will flow??? I think?? other may give a better or more accuate opinion??

Try floating the float in about 3 inches of gasoline, in a clean coffee can. Overnight. Might just have a leaking float. RJ

Hey people I dismantled the carb again cleaned again and the fuel keeps coming out of the air intake. I played around with the thing a ma bob that controls the rubber tipped pin which regulates the fuel. Still the same. I know I'm close to getting it going but frustration is creeping into my game. S.O.S

jimbo you probably need to post over in the toolshed forum for trimmers. most won't respond when highjacked on another post on different forum...if that's the craftsman model thats got the spark plug on the bottom good luck.

I bought a lawn tractor from a friend. He bought it from tractor Supply. Garage kept, and perfect maintenance. When I was going to pick it up he said gas flowed out of the carb. I bought new carb rebuild and replaced parts. It worked perfect but then there was a "pop' like a misfire. I stopped to fix breakfast for me and Grandson that was "helping". I came out and gas was dripping out carb. It has a module on float bowl. One man said I didn't really need that. Why the "Pop" that makes apparently float stay open. It's a Walbor carb. on Kohler engine.

I have an old Briggs mower, possibly a 1963 model. I can't start it without putting a small amount of gas into the carb. I was going to mow the lawn today, so I put some gas into the carb only to find out the gas was leaking from underneath. What does this mean? How can I fix this?

I got my briggs fixed, but once I put it back together, gas comes spilling out of the airfilter. I took apart, checked seal, and it is still leaking

Help any one?