Briggs and Stratton carb problem

i see the earlier thread of new gas.....how bout that primer bulb....is it new?...and is it seated all the way down tight?
 
I reset govenor to where it was.There is only one linkage to hook up. The primer bulb is not new and have debated replacement. Have gotten kind of side tracked with a broken toilet and smoked ceiling fan all in 2 days. I may purchase a new bulb tomorrow. Carb is corroded but when i pulled the welch plug that passage did not look bad. Carb also took on a dark color once it was soaked for a couple days. Needle seat was seated with ridges down. Thanks again for the help
 
ok.....i think your damn close to figuring it out.....be sure to plug the welch hole back up [thats where an idle screw would have gone].....and make sure the gaskets on both sides of the carb are good......oh one other thing...when you were blowing the seat area out....make sure it didnt come out of its position :thumbsup:...i would use some starting fluid on your next try.,.......keep us updated:smile:.........that primer bulb /air cleaner base may be whats hanging you up......http://www.partstree.com/parts/?lc=briggs_and_stratton&mn=12H802-1922-B1&dn=09900004
 
princeal said:
I reset govenor to where it was.There is only one linkage to hook up. The primer bulb is not new and have debated replacement. Have gotten kind of side tracked with a broken toilet and smoked ceiling fan all in 2 days. I may purchase a new bulb tomorrow. Carb is corroded but when i pulled the welch plug that passage did not look bad. Carb also took on a dark color once it was soaked for a couple days. Needle seat was seated with ridges down. Thanks again for the help
Click to expand...
when you say ridges down.....they need to be toward the carb and away from needle..is that what you meant?
 
Yes ridges down away from needle I have purchased a new primer bulb yet to install.hopefully this will be the key. Thanks again
 
thers alot of problems in the primer bulb area...sometimes those little foam filters behind them disintegrate and plug up stuff
 
princeal, I have the same exact issue on my mower, looks to be the same identical carb, just not quite as much corrosion.

B&S 123K02-0336-E1

Illustrated Parts Lists | Repair Parts & Maintenance Products | Shop | Briggs & Stratton

Have taken the carb apart and cleaned it about 4 times, haven't soaked it though. The needle/seat are new, carb/air filter gasket are new. Have checked the bowl nut and main jet both visually and with small wire, no blockage. I can also blow air from the fuel inlet and it moves thru normally in the upright position, and no air if upside down (so the float is working)

I can keep the mower running indefinately while pumping the primer bulb.

With the air filter off and mower running and pumping the primer bulb I can see fuel shooting up the main jet into the carb. Once I stop pumping the bulb the fuel stops shooting in and mower stalls.

What is the theory behind the gravity feed? I have fuel in the bowl, where does the suction/vacuum come from to pull the fuel up the main jet to mix with the air? Is it just suction from the air moving past the main jet? Or is it pushed out by pressure in the bowl?

I don't mean to hijack this thread, but will be watching closely for the resolution.

Thanks!
 
Most recent update NO CHANGE. Replaced primer bulb used starting fulid same result 4-5 sec run time and dies I refuse to give up but I can not figure out what my next step should be. As before I checked govenor etc. everything seems fine. Should I try to readjust the govenor ?
 
Ok, now I'm really scratching my head, but it is running.

I've been suffering trying to get this running for nearly a month and no clue what the cause was. I had it apart for the 5th time today hoping something would jump out at me as the cause, but after walking away from it for a few hours and coming back to put it together, clean up and call it a day I gave it one last shot.

Fired right up and kept running. The only thing I can think is perhaps there was a seal that wasn't completely tight. But I changed nothing from all the other times it was taken apart and inspected/cleaned.

Maybe it was just the luck of posting on this forum that did it...

I wish I had more to help you with, princeal. Sorry and Good luck!
 
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