Question about Poulan 42-Inch Steel Deck 17.5 HP Briggs & Stratton I/C Engine With 6 Speed

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I have gas going into my oil. 17.5 Briggs solenoid on carb bowl

I have pulled th OHValves and the head gasket looks good. The solenoid retracts when the ignition is switched. The valves, piston and valves look normal. The engine runs great after I pull the spark plug and blow the gas out of the cylinder and have changed the oil. The gas seems to run into the cylinder after it has sit 2-3 days. It don't seem to fill while running. It doesn't burn oil. The engine is 2 years old and never been mistreated.

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  • Master
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The problem is the float needle and seat are leaking. It is not shutting off the gas when the bowl is full. The bowl fills up, then runs down the intake through the intake valve into cylinder, past the rings into the crankcase. Fairly common problem. Just replacing the rubber tipped needle probably will not stop the leak. The pressed-in brass seat needs to be pulled out and a new one pressed in also. Possibly there is some trash or rust in the carb that has gotten between the needle and seat, but in my experience, it usually takes replacing both to fix.

Posted on Jun 25, 2009

  • George Dubbs
    George Dubbs Oct 02, 2015

    This is a common problem with the newer EPA required carbs...it is the failure of the positive shut off valve on the bottom of the carb....you can replace it but it will fail again only a matter of time...do yourself a favor put a manual shutoff valve in the gas line where you can easily get at preferably from the seat..just remember to shut it off EACH AND EVERY TIME YOU SHUT THE MOTOR OFF..no exceptions..you will not have that problem again.Had the same problem with my 171/2 husky mower...good luck

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The cheapest fix is change oil and filter and install an in line fuel shut off on the fuel line, turn on when operating turn off when your not!!

Posted on Jul 12, 2013

  • Dwain Pippen Sep 02, 2014

    Yeah, that works...only the first time you forget to turn it off...there you are again..fix it right...imho

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1 Answer

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MY BRIGGS &STATTON 18.5HP STARTS BUT PULSAITING REAL BAD, THEN JUST DIES, OR IT WILL START RUN GOOD MOW GOOD ONLY 10 MIN THEN JUST DIES!! AFYER SITTING A FEW MINS. IT WILL GET ME BACK TO THE GARAGE ...


you need to service your carb. it has a bowl on the bottom of the carb. it should have a screw or a nut holding the bowl in place some of the new ones have a spring clip. anyhow take it loose and there is some holes in the bolt that need to be cleaned out if tou dont have anything small enough homedepot and lowes sell a tip cleaning kit for cutting torches and it has some tiny wies that will work . some carbs have a screw in the middle of the hole after you take off the bolt look in the center and if it looks like a flat head brass screw then you can un screw that peice to and clean it thos tiny holes get cloged real fast get som carb cleaner and clean everything and the bowl it only takes gas 30 days to oxyzadize and it will leave behind a yellow scale like plaque on your teeth and will foul up the whole thing . keep note when removing the bowl one side is lower so keep it the same direction when removing it will allow the float to settle down right to allow the gas to flow into the bowl. the float has a little valve that has a rubber tip on it and it can get stuck and not work right if things seem clean and still runs funny get a carb kit from truvalue o a lawn epair shop get all info off side of motor . when installing bowl if you have a screw with a spring out the bottom of bowl screw all the way inn then turn back out 2 1/2 turns to adjust proper flow if screw is on side of carb turn same amount if too much gas is idling rough turn screw in some hope this helps

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2 Answers

Its a briiggs and stratton 16.5 hp model #313777 0112-E1. I'm gettin gas in my oil and am pretty sure float is sunk and it won't start at the moment. The carb bowl spins clockwise and counterclockwise but...


You need to determine if you have a Nikki or Walbro carb. The Nikki bowl is held on by two phillips head screws and the Walbro bowl is secured by either a single bowl nut or a anti-backfire soleniod (two wires going to it). Your problem is probably the seat in the carburetor. We see very few float problems since most of them are plastic.

If you have a Walbro with the anti-backfire solenoid you will need to get a slim 1/2 open end wrenc the access the "flats" on the solenoid to unscrew it.

The brass seat is replaceable in the Walbro along with the needle. If it's a Nikki, you may need to replace the carburetor.

Hope this helps

Feb 14, 2011 | Garden

1 Answer

Starting engine, Get Click, click, small amout of movement. Changed batt, sole, safe switch, starter, Remove Spark Plugs Engine Turns over Starter spins engine round & round. Plugs back in no good?


Check for spark at the spark plugs. If you have spark, the the problem is fuel related. If your carbs have an electrical solinoid below the bowl, unplug the wire connection and THEN unscrew the solenoid. There maybe a fiber gasket, be careful not to tear it. Unscrew the solenoid and check to see if clean fuel comes out of the bowl. If no fuel comes out, you have to clean the carb bowl and the jet. If clean and FRESH gas does come out of the bowl, then the (fuel shut off) solenoid is stuck in the OFF position. (the alcohol in our gas causes these solenoids to rust and stick) Buy a new solenoid.
NOW if you don't have spark, check the kill switches first, you may have 3 on a riding mower.You can temporaily bypass them if you don't have an ohm meter for testing.

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2 Answers

My briggs & stratton will not start


If the engine fires on starting fluid, then you are missing fuel, so you need to start with the source, is fuel getting to the carb? if not why not. Check fuel lines, shut off valves and filters.
If it is, is the carb float allowing the bowl to fill?
If there is fuel in th float bowl, then you need to look at mixture and idle settings.

hope this is of some help.
Ed

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2 Answers

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Pull the carburetor off and do a rebuild. Pull the gas tank and drain it of any debree . Clean all gas lines. Hope this will help you.donnyb60

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