The seat may be damaged. you'll have to replace the whole carb
The fuel inlet needle valve is not functioning as it should. Could be debris between the needle and seat or bad needle or bad seat.
To test, clamp off fuel line and remove fuel bowl. Then remove clamp and raise float to a position parallel to carb body. If fuel continues to flow or drip then the needle valve is not working propery. If fuel stops then could be something interfering with float movement or bad float.
SOURCE: Briggs & Stratton 6.5 hp Quantum
The problem that you are describing is caused by intake valve not seating correctly. I see this problem on engines that have many hours of use or lack of service. You may be able to grind /reseat /adjust valves but usually requires new guide, valve and spring. Enjoy
SOURCE: craftsman lt1000 18 hp briggs keeps wanting to die
could be a dirty carb. Did you use stabil over the winter. Also could be a govener problem.
SOURCE: Gas leaking from carb on Briggs and Stratton engine
`v already answerd this,are you slow? with oil in the sump you can do no damage by running the engine with abit of smoke,it will clear up very quickly. i find it hard to believe youhave done the things you claim if you dont know what a carby bowl is!! it is the receptical under the carby,take brigg`s advice and replace the gasket it is needle and seat or flappervalve
SOURCE: Craftsman riding mower floods after a few seconds
FYI...just thought I'd give a little back...
had exactly the same mower/plow w/ same issue !
mine is an older L-head from pre-1998...used....
19.5hp 3 screw type diaphram fuel pump carb...
the pic's and how to assemble... I will send if,
you email me... Instructions do not come from
B&S when you buy there part # 694056... = 10$
carb rebuild kit...they want to sell the manual too !!!
sku# 0 24847 26246 9 ...shame on them !
they are selling manual # 27xxxx for 20$...
to tell you what to do ! ....%$#-THEM !!!
I made a pdf...with before and after pic's of
how to rebuild this carb...it's quite unique in fuel pump design and simplified governor operation...
...
running well this 19.5 twin - fan cooled...is like a 25HP !
the carb kit from B&S is generic...w/extra parts...
I have pic's of the actual ones used/needed for this
carb... Main jet is mis-labeled...it's a bowl vent !
There are no jet's to adjust on this carb...
only adjust is idle speed post the governor linkage !
also shown functioning in my .pdf...
hit my mail ..... driscoll_at_pzdi_"dot"_com
or visit www _ pzdi _ com
248-390-3541
SOURCE: I have a craftsman DLT 3000 with the 18.5 hp
Well, I'm no Briggs expert, but I'm wondering if the spark is inconsistent or weak. Have you checked the gap? Also, you might try taking the plug out but leaving the wire on it, lashing the base to something grounded, using bare wire, and then turn it over while looking to see how bright the spark is.
I suspect these no longer use a magneto and/or points, which they did when I learned about them, so I won't try to guess what else might be wrong with the ignition. Still, it would be very quick to check for loose wires, condition of the spark plug wire, etc. I guess most of them are probably under the flywheel, though.
I'm just mentioning the above because they are easy to check. Might as well do that stuff first. I guess it's just as possible the mixture is off or something, but that's more work.
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Thanks for the response.I have checked and the carb is now obselete
give me the model, type and code off the engine shroud and I'll research it. otherwise you might be able to put an inline fuel petcock in the fuel line and only turn it on when you need to run it.
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