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  1. #1

    Join Date
    Jun 2018
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    Simplicity

    Help with Carb Issues

    Hello, I am hoping you guys can give me a hand..

    I'm trying to help out a friend to get his mower running.. He has a Simplicity 38" rider with a Briggs and Stratton 356777 engine. He was having trouble with it staying running so I cleaned the carb for him (just a cleaning, no carb kit). It then ran fine for 10-15 min before I left his place. While I was there I noticed that the inline fuel filter would only fill up about 1/4 of the way when it was running (full if it sat off for a while). Now it'll sputter, blow smoke and die. He had somebody else look at it and they told him that it wasn't getting enough fuel. They checked the lines and determined that the fuel pump was bad, so he replaced that. Now he says that it still sputters, blows smoke and dies but also blows fuel into the air filter through the brass hole in the upper left corner of the attached photo. He said that when this hole is plugged with your finger, it runs much better..

    He lives about an hour away and with my work schedule, I can't get there for a few days. I am also not sure where this brass hole leads to or what it does.. Any ideas what is going on, what this hole is for and what you think the issue with the mower could be??

    Thank you

    T2YA1bo.jpg

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  3. #2

    Join Date
    Mar 2012
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    Wisconsin
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    Toro

    Re: Help with Carb Issues

    Willing to bet you will find a bad head gasket. Try this remove the spark plug wire on one side and see if it will start. Repeat on the other side. If the engine will run, or run better, on one cylinder and not on the other youíve found the problem. The cylinder which runs best is the good cylinder. The plug on the bad cylinder will be carbon and oily.
    This is only my opinion, and many will say it ain't worth a darn, as I'm only a retired grease monkey instructor and not a professional mechanic. Use what I post at your own risk as you know teachers only know book knowledge.

  4. #3

    Join Date
    Jun 2018
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    Simplicity

    Re: Help with Carb Issues

    thanks, i'll have him give that a try tomorrow

  5. #4

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    Troy-Bilt

    Re: Help with Carb Issues

    Hey Troops .............

    That fuel filter being not full while running is normal...... But the smoke and sputtering is not normal.... I do agree with Rivets about a head gasket.....

    You or your buddy need to check the oil and make sure it's not MAKING oil..... Such as a head gasket that's blown or a leaky needle and seat in the carb...... Depending on what carb you have on there.......

    I really can't tell from the picture you posted.... Can you or your buddy take another pic ?? A lil further out for a better view.. He can send you one in a text and then you can post it.......

    As for as the engine running with a finger on the brass hole... That means something is not right in the carb itself..... Like I said another pic would help a lot.........

    Let us know Mon Ami ~!~!

  6. #5

    Join Date
    Mar 2012
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    Toro

    Re: Help with Carb Issues

    That brass hole is probably the crankcase vent and if so, the engine will run slightly better when plugged for a short period of time, due to more back pressure. This is another indicator of a possible blown gasket, not a carb problem.
    This is only my opinion, and many will say it ain't worth a darn, as I'm only a retired grease monkey instructor and not a professional mechanic. Use what I post at your own risk as you know teachers only know book knowledge.

  7. #6

    Join Date
    Jun 2018
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    4
    Location
    United States
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    Simplicity

    Re: Help with Carb Issues

    Here is a photo that shows the port I am talking about.. Not his actual carb but I believe it is the same model. Port I'm talking about is circled. If I remember correctly, when I was cleaning it, I think this port leads to the bowl (maybe a vent or overflow?)

    O3anGmj.jpg

  8. #7

    Join Date
    Mar 2012
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    Toro

    Re: Help with Carb Issues

    Iíve reread your posts and canít see where you mentioned anything about a port, before your last post. I honestly have no idea where the hole youíve circled goes to, could be the bowl vent. Small engine carbs have no overflow tubes. I donít understand why you are fixated on the carb, you original post description has the signs of a blown head gasket on one side. As I said earlier, that hole in the air cleaner base is a crankcase breather or vent and has nothing to do with the carb.
    This is only my opinion, and many will say it ain't worth a darn, as I'm only a retired grease monkey instructor and not a professional mechanic. Use what I post at your own risk as you know teachers only know book knowledge.

  9. #8

    Join Date
    Jun 2018
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    Simplicity

    Re: Help with Carb Issues

    Thanks for the suggestions everybody. It appears we have figured out the issue and it was a bad float. Turns out it was sinking and letting way too much fuel into the carb, causing the fuel to blow out the port that I was talking about.

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