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Fuel runs straight through carburetor to engine, cleaned needle valve, it works, never seen this before. gas contaminates oil.

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Make sure the float has no gas in it...it must float to shut the needle valve.
Gary

Posted on May 27, 2011

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Have K341s engine on a welder and crank case flooded with fuel. what should I look for?


It is likely that this engine has a gravity feed fuel system such as the lawn tractor in the photo. The problem is if the needle valve sticks open, float fails to push the needle into the seat fuel will flow until the tank empties. The fuel floods the engine and leaks by the valve stem and cylinder rings filling the crank case with fuel.

What a mess and always a concern when fuel leaks. The preventative is to make sure the fuel shut off valve is closed when engine is not being used. Usually running the engine with the shut off valve will empty the carburetor of gas a good procedure to prevent the carburetor from fouling.

You must drain the oil completly and replace before running the machine.

Likely with the engine vibration the needle will operate normally. Removing the bowl and checking for contamination is recommended.

Adding a new filter and confirming the fuel shut off is working is also recommended.


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Jun 29, 2017 | Cars & Trucks

1 Answer

Kohler Command 14 OHV, Simplicity, riding lawnmower. oil is mixing with gas and blowing out valve cover breather tube and into air filter chamber. What's wrong?


The needle and seat in the carburetor are not sealing. If you don't want to have the carburetor rebuilt what you need to do is change the oil and install an inline fuel shut off valve in the fuel line so you can turn the gas off when the mower is not running or in use.

Apr 17, 2016 | Garden

2 Answers

Carburetor leaking gas


PROBABLY YOUR CARBURETOR FLOAT INSIDE THE CARBURETOR IS NOT WORKING DUE TO MALFUNCTION OR DUE TO SOME DUST SETTLED IN THE FLOAT PIN THAT BLOCKS THE FUEL ONCE THE CARB IS FULL. IF U ARE TECHNICAL THEN FIRST CLOSE THE FUEL TAP, PULL THE FUEL PIPE FROM THE FUEL TAP SIDE CAREFULLY AND TRY TO INJECT CARBURETTOR CLEANER IN THE FUEL PIPE AFTER FEW MINUTES TO HAVE SPACE INSIDE THE CARB FOR CLEANER TO TAKE ITS PLACE. THEN CONNECT THE PIPE OPEN THE FUEL TAP AND CHECK THE LEAKS. OF ALL OK TRY TO RUN THE ENGINE IT MAY STOP OR THE RPM COULD VARY DUE TO CLEANER. DONT WORRY IT WILL BE OK IN FEW NIMUTES.
SINCE IT IS HIGHLY RISKY AND FUEL COULD IGNITE . EVEN IF U ARE TECHNICAL YOU SHOULD TAKE PRECAUTIONS OF FIRE THAT COULD BE IGNITED BY SPARK PLUG WIRE.
YOUR GENERATOR SHOULD BE 10 TO 20 FEET AWAY FROM RESIDENTIAL AREA OR CAR ETC AND KEEP HANDY A FIRE ESTINGUISHER. OR SIMPLY TAKE TO TO YOUR CAR MECHANIC WHO SHOULD DO THE JOB WELL.

Aug 28, 2012 | Briggs Stratton Portable Generator 305cc...

1 Answer

I have an 18hp els series overhead valve briggs and stratton engine on my lawn tractor. I had problems with hard starting and readjusted the valve clearances which took care of that problem. I am also...


Hi, there are two possible causes. Firstly have you changed the oil since you had the flooding issue? If not the oil will be fuel contaminated which will make the mower run rich by drawing fuel vapor via the crankcase vent. Secondly remove the carby bowl, hold the float exactly parallel with the carby body with the fuel tap on. No fuel should flow out until you lower the float from parallel. If it does replace the needle under the float. Hope this helps, regards Phil.

Jul 04, 2011 | Poulan Garden

1 Answer

The filter box on my 1996 200 se keeps filling with gas unless gas is shut off after each time i use , wonndering whats wrong? thank you.


Your carburetor is overflowing gas. Your carburetor should be disassembled and cleaned. Inspect the float and float needle and seat. You may have to replace one or both to get the fuel to shut off. If the float sinks when placed in gasoline replace it. Just replace the needle and seat assembly as a precaution. The only other source of gas in the air box and often the engine crankcase, is caused by a leaking diaphragm on the fuel petcock. If the diaphragm is cracked or has a hole in it , replace the diaphragm or the petcock assembly (if that is the only way it is available) and the leak should be fixed. It is always a good idea to turn your fuel off when not riding. Even a motorcycle in perfect working order can sometimes have a float needle stick and fill the engine with gasoline. Be sure to check that your oil has not been contaminated with fuel. If it has you will need to change your oil also.

May 29, 2011 | 2002 Suzuki DR 200 SE

1 Answer

Bike will not start because its flooding profusely.so much so, it comes out the exhaust pipe . help


If you have a vacuum petcock make sure the diaphragm does not have a hole in it causing fuel to bypass the fuel petcock.
Note: always turn your fuel off when not riding. Not turning off your fuel petcock might cause your engine to fill with gas. Make sure your oil is not contaminated with gas. If it is you will have to do an oil change. It is possible that your air filter is now soaked with oil.
Next you may have to take your carburetors apart and clean them. They could have gummy gas in them causing the float needles to stick open flooding the engine. When cleaning inspect thew needles for wear, damage, and bad rubber shut off tips and replace them if necessary.

Mar 20, 2011 | Honda CB 100 Motorcycles

2 Answers

Fuel is leaking into the engine and spraying out the case breather along with engine oil. when I drained the oil, mostly gas came out.


sounds like you may have a stuck float in the carburetor and gas is just washing in the motor!

remove the carburetor and remove the bottom bowl of the carburetor and see if the needle valve that is attached to the float is stuck!

hold the carburetor straight up and down and with your finger press up on the float and then let it down. the needle valve should move smoothly up and down with the float! while you have the bowl off you should clean the internal components very thoroughly!. also while holding up on the float you should not be able to blow into the feed tube of the carburetor and then when let back down you should be able to blow through it. if you can blow through it while in the upright position you will need to replace the seat and valve. good luck

Sep 23, 2009 | 1985 Yamaha XJ 700 X Maxim

3 Answers

Riding lawn mower keeps flooding


It sounds like the inlet needle seat is not closing all the way,allowing fuel to overfill the carburetor.The inlet needle seat may have dirt in it.You will have to remove the carburetor bowl and check for dirt or debris in bowl,if so remove the float assembly and check for a peice of dirt between the inlet needle and seat.If there is none you may have to replace the carburetor or rebuild it with a carburetor kit.You should also chang the engine oil because the overfilled carburetor drains to the crankcase,filling it with fuel,check the oil level and see if it is high,that would indicate fuel is in the oil.Hope this helps

Jul 28, 2009 | Craftsman 20 hp 42 in. Deck Lawn Tractor -...

3 Answers

Hi my craftsman lawnmower,model #944360480 is leaking gas through the air filter,muffler and I think the engine.I change the inlet needle seat,clip, also the float.Now it leaks gas in the same places after...


Hello:

If you Did Not Soak the Carburetor Overnight in Cleaner, then
>>The Following is a Basic File I Made for Cleaning Carburetors. Any Input is Appreciated. Even though the Carburetor Looks Clean, the Internal Passages May be Restricted with Varnish that Gas Causes to Build Up over Time.
>>Spray Cleaners Remove this Varnish in Layers, so Soaking is the Only Sure Way to Remove ALL this Varnish.
>>I have Found that Most People can Use a Breakdown/IPL and Disassemble the Carburetor Enough for Proper Cleaning.
>>You Only have to Remove the Bowl (if Applicable), Float Pin (if Applicable), Float (if Applicable), Needle Valve.
Remove Any Adjustment Screws that Go Into the Carburetor Body. The Welch Plugs Do Not have to be Removed.
>>If you are Able to Remove and Disassemble the Carburetor and Keep the Gaskets Intact, then Usually these Gaskets can be Reused. The Only Parts you May Need to Replace is the Needle Valve.
>>The Float Needle Usually is Not Replaced Unless it is Not Operating Properly (the gas flow not shutting off and the carburetor is Flooding). Do Not Remove the Main Nozzle. This is a Pressed Fit and Removal is Not Required for Cleaning. Soaking and Blowing the Carburetor Out After Soaking will Clean the Nozzle.
>>Once Disassembled, then Soak the Carburetor Body and Parts in a 1 Gallon Can of Gunk Carburetor Cleaner Overnight. The Can has a Parts Tray Inside it for the Small Parts.
>>Once the Carburetor and Parts are in the Cleaner, you can Replace the Lid for Safety and to Prevent Accidental Spillage. Then Blow Out the Passages with Compressed Air.
>>***(Do Not Use High Pressure Air for the Zama Carburetors, they have Check Valves for the Primer and these are Usually Blown Out of the Carburetor if Not Careful. Allow the Zama Carburetor to Set on a Drip Pan and Dry)***.
>>****All the Carburetor Adjustments are the Same for Lawn Mower and Trimmers. There are Several Location for the Air Mixture Screws. The Idle Air Mixture Screws are Usually Located at the Top of the Carburetor Bowl and the Top of the Carburetor Body.****
>>If the Main Air and Idle Air Mixture Screws are Side by Side on the Side of the Carburetor, then the Idle Air is Nearest the Engine. The Main Jet Air Mixture Screw is Located in the Bottom of the Carburetor Bowl or Beside the Idle Air Screw on the Side of the Carburetor Body.
>>Some of the Older Model Carburetors have the Main Jet Mixture Screw Straight in from the Top of the Carburetor Body (this is Rare anymore). If you have Cleaned the Carburetor (Disassembled and Soaked Overnight in Carburetor Cleaner (I Use Gunk). Then Blow Out the Passages with Compressed Air and Install a New Kit if Required. Now Setting the Air Mixture Screws:
>>****Turn the Idle Air and Main Air Mixture Screws In Until SNUG **Do Not Jam** Then Reverse Both Screws 1 1/2 Turns. Holding the Throttle Full Open, Start the Engine. Turn the Main Air Mixture Screw Clockwise Until Proper Revs are Obtained. Occasionally you May have to Turn this Counter Clockwise to Achieve the Proper Revs. Now Allow the Engine to Idle. Set the Engine Idle Screw (Not Idle Air) so the Engine will Stay Running if Required. Now Set the Idle Air Mixture Screw so there is No Hesitation when Throttling from Idle to Full Throttle. Reset the Engine Idle if Required.****
>>If This Carburetor has a Single Air Adjustment (Except Tank Mounted 9200 and 100900 Engine Model Carburetors), Use the Section Above that Pertains to Full Throttle RPM Air Mixture Screw and then Adjust the Screw if Required to Eliminate Any Hesitation when Throttling from Idle to Full Throttle.
>>For the 9200 Model Tank Mounted Carburetor Adjust the Air Mixture Screw Full In, then Reverse 1 1/2 Turns. Set the Throttle Lever to Full Throttle and Start the Engine.
>>Now Carefully Use 1 Finger and Open the Throttle Plate and Over Rev the Engine Slightly. If the Engine Over Revs and Does Not Struggle to Over Rev, then the Carburetor is Set. If the Engine Struggles to Over Rev, then Turn the Adjustment Screw In 1/4 Turn and Repeat the Over Rev Test.
>>If you Adjust to 1/2 Turns In and the Engine Still Struggles to Over Rev, then Return the Adjustment Screw to 1 1/2 Turns Out from Snug and Turn the Screw Out 1/4 Turn. Do the Over Rev Test. Continue this Process Until you have the Engine Over Revving without Struggle.
>>By Adjusting the Carburetor on this Style Carburetor Until the Engine Over Revs without Struggle, you have Adjusted the Air Mixture to the Best Possible Setting.
>>This file was Intended to Give you the Basic Carburetor Cleaning Instructions and May Not Reflect Your Carburetor Components.
>>If you have Questions, Please Ask. The links above Provide Good Directions on Cleaning the Carburetor. Make sure you use an Compressed Air to Blow through all the Carburetor Passages to make sure they are Clear.
>>1- http://www.repairfaq.org/samnew/lmfaq/lmclctc.htm
>>2- http://www.cpdonline.com/692509.pdf .
>>The Following is an Instruction File I Made for the Gas Contamination of the Crankcase Oil. Any Input Concerning the File is Appreciated.
>>Depending on the Engine Model, Usually the Gas in the Crankcase Oil or White/Blue Smoke is Caused by the Carburetor Float Needle Valve Not Seating Properly and Allowing the Gas to Flood the Carburetor and Engine. Then the Gas Seeps by the Rings and Enters the Crankcase and Contaminates the Crankcase Oil.
>The Smoking is Caused Not Only by the Flooded Crankcase but can be Caused by 1 of the Following; a Bad Diaphragm in the Fuel Pump, a Blown Head Gasket between the Cylinder and Push Tube Galley, the Crankcase Vent Stuck/Frozen/Broken or the Carburetor Flooding the Engine.
>>1- Clean the Carburetor and Replace the Float Needle Valve (and Seat if this Model has One). A- **Remove, Disassemble and Soak the Carburetor Overnight in Carburetor Cleaner (I Use Gunk). I have Found that Most People can Use a Breakdown/IPL and Disassemble the Carburetor Enough for Proper Cleaning. You Only have to Remove the Bowl (if Applicable), Float Pin (if Applicable), Float (if Applicable) and Needle Valve and Any Adjustment Screws that Go Into the Carburetor Body. The Welch Plugs Do Not have to be Removed. Then Soak the Carburetor Body and Parts in a 1 Gallon Can of Gunk Carburetor Cleaner Overnight. The Can has a Parts Tray Inside it for the Small Parts. Once the Carburetor and Parts are in the Cleaner, you can Replace the Lid for Safety and to Prevent Accidental Spillage. Then Blow Out the Passages with Compressed Air. Install New Parts if Required.**
>>If the Carburetor Float Needle is Good, then; 2- Block the Outlet Port and Pull a Vacuum on the Fuel Pump. If it Holds Vacuum, then it is Good. If Not, then the Diaphragm is Busted and the Pump Requires Replacing. If the Fuel Pump is Good, then Check the Crankcase Oil for Gas Contamination.
>>If the Crankcase Oil is Contaminated, then Drain and Refill the Crankcase Oil with Fresh Oil.
3- **If the Mower has a Manual Gas Shut Off Valve: Check the Manual Cut Off Valve and Make Sure it is Cutting Off the Gas Flow to the Carburetor. A- If Not Stopping the Gas Flow, then Replace the Valve. B- If the Mower Does Not have a Manual Cut Off Valve: Install a Manual Cut Off Valve and Turn Off the Gas Flow when the Engine is Not in Use. These Carburetor Styles Tend to Allow Gas to Seep by the Rubber Tipped Needle Kit or the 2 Pc O-Ring Needle Kit. A I Believe I Said Before, I have Seen a Lot of these Problems and this is the Way I have Found to be Sure the Crankcase Oil Does Not become Contaminated with Gas Again.**
>>4- If the Valve is Good or has Been Installed, then Remove the Cylinder Head. On the OHV Engines the Head gasket will Blow Between the Cylinder and the Push Tube Galley. This Allow Oil to be Sucked Into the Cylinder from the Crankcase and the Extra Oil is Just Enough to Cause the White Smoke.
>>5- Check the Crankcase Breather and Make Sure it is Clean and Operating Properly.
>>6- If the Crankcase Breather Sticks, then Oil is Pulled from the Crankcase into the Carburetor Throat and this Causes the White Smoke.
>>7- If the Crankcase Oil is Good, then Check the Gas Tank Cap and Ensure it is Venting the Tank. If the Gas Cap is Not Venting the Tank, then Pressure Builds in the Tank and the Pressure Pushes Gas by the Carburetor Float Needle Valve and Floods the Engine and Crankcase Oil.
Please, Do Not Hesitate, If I Missed Something or you Hit a Snag or this Does Not Correct the Problem, I am Here if You Require More Assistance.
Hope this Helps. Let me Know What Happens, Please. May the All Mighty Bless You and Yours. Be Safe and Be Happy. Thanks.

Good Luck

Respectfully

jbridger (John)

May 15, 2009 | Garden

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