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Briggs 15 HP Lawn Mower Engine Issue: Excess Fuel Spilling from Spark Plugs & Valve Cover

zbyszek144 9921 11
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  • #1 16473436
    zbyszek144
    Level 9  
    Hello, I have a problem with the 15 HP lawn mower Bringss engine, namely where the oil is to be full of fuel. I unscrewed the candles, a lot of fuel spilled out, unscrewed the valve cover also a lot of fuel spilled out, what could it be? Please help.
    greetings
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  • #2 16473603
    21paweł21
    Level 16  
    Someone has infusions.

    Basic question. It worked and broke or the story unknown ???
  • #3 16473737
    zbyszek144
    Level 9  
    It worked until the end. I drove, mowed, later as if shot from a muffler, burst into fire, then it was ok, worked ok, extinguished and the next day a puddle of fuel, leakage from under the valve lid. I removed the candles, lots of fuel, and the fuel in oil :(
    What is?
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  • Helpful post
    #4 16473791
    21paweł21
    Level 16  
    It looks like the fuel is coming from the carburetor through the valves to the engine. You need to disassemble the carburetor, it can be, for example, a suspended float or needle valve and does not close the fuel.
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  • #6 16474262
    zbyszek144
    Level 9  
    Is it a solenoid valve under the carburetor? And can it be the reason? How to check if it works properly?
    greetings
  • Helpful post
    #7 16474461
    21paweł21
    Level 16  
    You can check this solenoid valve (here you have something about it https://www.elektroda.pl/rtvforum/topic2901296.html) it "closes" the fuel to the main nozzle so if it is not closed and a suspended needle valve or leaky float fuel can go ahead go through the suction valve to the engine.
  • #8 16474766
    zbyszek144
    Level 9  
    Thanks, I'll check it out

    Added after 8 [hours] 25 [minutes]:

    Thank you for your help with this carburetor. It turned out that this solenoid valve hung and did not close. I started it and connected it for a short time, it worked properly. I was able to fire it, walked well, maybe it will be OK.
  • #9 16476419
    21paweł21
    Level 16  
    I would advise you to check the float and the needle valve as well as the fuel level in the float chamber because the malfunction of the solenoid valve should not manifest itself in this way.
  • #10 16477540
    zbyszek144
    Level 9  
    I watched the float, by the eye it was ok, not leaky etc. I just don't know how to check this fuel level in this chamber. And this needle valve you know buddy where it can be? I have only doubts about the screw that is adjustable the distance from the needle of this solenoid, someone was regulating it and has slightly bit it and may it not close there? What do you think?
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  • #11 16477752
    21paweł21
    Level 16  
    The valve is next to the float hinge in the carburetor body. If the float is made of copper, it has a "tongue" and if there is a plastic float, it doesn't regulate the level there.

    Illustrative image https://obrazki.elektroda.pl/5071266500_1296160012.jpg borrowed from the topic https://www.elektroda.pl/rtvforum/topic1841602.html#9066654

    Information on carburetor adjustment can be found on the Internet, there are many photo-guides.
  • #12 16477959
    zbyszek144
    Level 9  
    Ok, the float is made of plastic. Thank you for further advice so I will continue my doctorate :)
    greetings
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Topic summary

The discussion revolves around a 15 HP Briggs lawn mower engine experiencing excessive fuel leakage from the spark plugs and valve cover, leading to fuel contamination in the oil. The user reports that the engine functioned normally until a sudden issue caused fuel to spill out after removing the spark plugs and valve cover. Responses suggest that the problem may stem from the carburetor, specifically a malfunctioning float or needle valve, which could allow fuel to enter the engine. The solenoid valve under the carburetor is also identified as a potential culprit. After troubleshooting, the user discovers that the solenoid valve was stuck and not closing properly, which was resolved by reconnecting it. Further advice includes checking the float and needle valve for proper function and fuel level in the float chamber.
Summary generated by the language model.
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