Briggs and Stratton carb leaking fuel and fuel in the oil

LMPPLUS

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  • / Briggs and Stratton carb leaking fuel and fuel in the oil
JohnnyCanuck, Bert's right the main jet o-ring is very problematic replace it with a Kawasaki #92055-7013 (B&S) doesn't sell them except on the main jet, you might take a close look at the float needle if it's grooved or torn replace it and bowl gasket and you should be good to go. And use non-ethanol gas.
 

JohnnyCanuck

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  • / Briggs and Stratton carb leaking fuel and fuel in the oil
Thank you everyone. I’ll be taking the Nikki carb apart tomorrow to see what it looks like inside. I’m in Europe, I just buy the regular 95 gasoline, which is all that is available here. Could be age related - this particular Briggs probably has between 350 and 400 hours on it, if not more. I also think the fuel shutoff solenoid may not be working. I can’t hear it clicking anymore. I’ll try testing it with a 9 volt.

Spent the day fixing a top oil seal leak and replacing the flywheel on a 15+ year old Tecumseh VLV-126. Ran it for 30 minutes and no oil! Been trying to fix this for quite a few years.
 

Joed756

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  • / Briggs and Stratton carb leaking fuel and fuel in the oil
Will not resolve an actual problem of a defective gasket. Just gives a false sense that nothing is wrong and just masks the real problem.
But if a leak develops it keeps your garage from being flooded with gasoline.
 

salbe

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  • / Briggs and Stratton carb leaking fuel and fuel in the oil
Hello everyone,

I have a Briggs and Stratton 155 Series 4 that I took out for the spring. It’s about 5 or 6 years old. I have cut a 2 acre lawn 3 times with it this year. I cut the lawn yesterday and stopped the mower. It was working fine.

When I came back from lunch, I smelled fuel. Fortunately, I didn’t start the engine. It was parked level and when I checked, there was fuel running off the riding mower deck and fuel in the oil. I have added a photo. As you can see, the carb is really wet with fuel and it was dripping pretty good from the mower deck.

I am guessing this is some type of carburetor issue?View attachment 64727
I just had same problem, I replaced fuel solenoid shut off valve. I have b&s 17.5 hp on a craftsman LT 1500, it has quite a few years on it so I replaced the Nikki carb. With aftermarket carburetor. Also put on new battery but it ran down so I am replacing regulator. I must admit this old mower has been treated roughly.
 

JohnnyCanuck

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  • / Briggs and Stratton carb leaking fuel and fuel in the oil
I took apart the Nikki carb. It was full of fuel and there was fuel up in the crankcase vent tubing. I also took the opportunity to drain out the engine oil. It was full of gas as evidenced by the rainbow colours that were appearing as it drained.

I got the carb apart. I tried blowing past the needle valve when it was open and closed. When open, the air would go through, when closed, no air path. I think the needle valve is working properly. I couldn’t see anything obvious, but I have attached a photo. The black rubber gasket and the circular black seal seem to not be very pliable. I did see something that looked a little suspicious and I have included a photo. Inside the circular area (is it a fuel passage?) there is some kind of fragment that looks like part of a gasket/seal, but I couldn’t locate where it came from. There seemed to be no rubber seal on the end of the emulsion tube. In fact, I couldn’t get the emulsion tube to move. It seemed really fixed in there.

Any advice (besides changing the circular black seal and the main gasket would be appreciated. I don’t want this to happen again and I need this machine in working order.

Thanks!!
 

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bertsmobile1

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  • / Briggs and Stratton carb leaking fuel and fuel in the oil
The hard O ring will allow fuel to leak past the float valve
Replace it
Chek what part you order because there are 2 varieties of this seal
One has the "o-Ring" as part of the seal & the other ( latter style ) has it as a stand alone item .
 
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