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Float valve question #4566116
11/06/17 06:36 PM
11/06/17 06:36 PM
Joined: Jan 2006
Posts: 1,181
Ohio
Dave Sherman Offline OP
Dave Sherman  Offline OP

Joined: Jan 2006
Posts: 1,181
Ohio
How long should one reasonably expect a float valve to hold back fuel? Both my lawn tractor and snowblower (2-stroke) have the same problem; if I let them go more than a week or two, the valves seep several ounces of fuel and the engines are flooded. I'd replace the float valve, but they aren't too easy to come by as the tractor is nearly 30 years old and the snowblower is 15 years old. The tractor at least has a shutoff valve to prevent that, but the snowblower doesn't.

Unfortunate since I've cleaned up the carbs with Gumout when they were given to me after sitting for several years, but they run fine if I can get them started. Actually, the tractor starts immediately if I remembered to turn off the fuel last time and turned it on before cranking. The snowblower is especially frustrating since I ran it dry last spring, I gassed it up last week, and it started on the first pull. I tried starting it again last night, and it took over a dozen pulls as it was puking raw gas out of the exhaust until it ran.

Short of trying to find new float valves or replacement carbs, what can I do?


2015 Honda Pilot EX AWD Valvoline 0W-20 Bosch filter
1977 MG Midget Valvoline VR-1 20W-50 Bosch Filter
Re: Float valve question [Re: Dave Sherman] #4566223
11/06/17 08:35 PM
11/06/17 08:35 PM
Joined: Aug 2008
Posts: 24,192
ON, Canada eh?
StevieC Online content
StevieC  Online Content

Joined: Aug 2008
Posts: 24,192
ON, Canada eh?
The spring tension on the needle & seat is the problem or the needle is not sealing on the seat because of gunk in the seat (Usually Ethanol Residue). You might need to bend the spring slightly (not too much) so that the needle contacts the seat at shut down or clean the seat and needle (or replace). I had this problem with my snowblower.

The float just keeps the bowl full.

If you are having this problem in two pieces of equipment I would be more inclined to think that it's residue on the needle/seat that is causing your problem and it just needs to be cleaned. Taking a Q-Tip soaked in brake cleaning and spinning in the seat and against the needle works well if it fits.

Like this: https://www.youtube.com/watch?v=zlez_hdoWYk (1:41) (I use brake cleaner)

Last edited by StevieC; 11/06/17 08:40 PM.

'18 Dodge Grand Caravan GT - 26k KM - AMSOIL SS 0w20
'06 Hyundai Santa Fe - 535k KM AMSOIL SS 0w30
Re: Float valve question [Re: Dave Sherman] #4566387
11/07/17 12:54 AM
11/07/17 12:54 AM
Joined: May 2006
Posts: 4,082
Central Wisconsin
dwendt44 Offline
dwendt44  Offline

Joined: May 2006
Posts: 4,082
Central Wisconsin
Twp solutions.
Keep fuel tank near empty when storing.
Install a fuel shut off valve in fuel line.
They are cheap.
Amazon has all kinds of deals on them.


There's no such thing as:
Too big of a battery,
Too large of a gas tank,
or too loud of a horn,
or too bright headlights.
Re: Float valve question [Re: Dave Sherman] #4566674
11/07/17 10:56 AM
11/07/17 10:56 AM
Joined: Apr 2014
Posts: 637
MN
ironman_gq Offline
ironman_gq  Offline

Joined: Apr 2014
Posts: 637
MN
If you can figure out what the carb is you should be able to find parts pretty easily, 30yrs old isn't that old in terms of small engine parts and the same parts could be and likely are still made. Even discontinued parts show up on Ebay pretty frequently.

Can you tell us what the two machines are?

Re: Float valve question [Re: Dave Sherman] #4572714
11/13/17 12:38 PM
11/13/17 12:38 PM
Joined: Jan 2006
Posts: 1,181
Ohio
Dave Sherman Offline OP
Dave Sherman  Offline OP

Joined: Jan 2006
Posts: 1,181
Ohio
Thanks all. I found a replacement carb for the snowblower on Amazon ($14). After tearing down the old one, I found the amount of gunk inside made it somewhat remarkable the thing actually ran. FYI, it's a Snapper C3203 with a Tecumseh HSK-600 engine. Although it didn't seem to be seeping noticeable amounts of gas, it would flood easily and run rich. Got a new spark plug on the way too, the old one looked pretty cruddy. The tractor is a John Deere RX75 with a Kawasaki FC-290V engine. Some carb parts are still available through the nearby Deere dealer (including a float valve), although the rebuild kit is discontinued.


2015 Honda Pilot EX AWD Valvoline 0W-20 Bosch filter
1977 MG Midget Valvoline VR-1 20W-50 Bosch Filter
Re: Float valve question [Re: Dave Sherman] #4572986
11/13/17 04:52 PM
11/13/17 04:52 PM
Joined: Apr 2014
Posts: 637
MN
ironman_gq Offline
ironman_gq  Offline

Joined: Apr 2014
Posts: 637
MN
https://www.partstree.com/parts/kawasaki...e/carburetor_2/

https://www.jackssmallengines.com/jacks-...290v/carburetor

If nothing else it's usually not too hard to make a different carb fit the engine, usually just an adapter and a little playing around with the jets and linkages.

Re: Float valve question [Re: Dave Sherman] #4573106
11/13/17 07:11 PM
11/13/17 07:11 PM
Joined: Aug 2008
Posts: 24,192
ON, Canada eh?
StevieC Online content
StevieC  Online Content

Joined: Aug 2008
Posts: 24,192
ON, Canada eh?
Good thumbsup


'18 Dodge Grand Caravan GT - 26k KM - AMSOIL SS 0w20
'06 Hyundai Santa Fe - 535k KM AMSOIL SS 0w30
Re: Float valve question [Re: Dave Sherman] #4575762
11/16/17 08:43 AM
11/16/17 08:43 AM
Joined: Jun 2011
Posts: 1,268
Texas
wag123 Offline
wag123  Offline

Joined: Jun 2011
Posts: 1,268
Texas
For future referance, the carb on the Tecumseh has an aluminum inlet needle valve and replaceable viton rubber seat. The most common problem with this carb is that the brass float will develop a leak and sink. Simply replacing the needle, seat, and float will solve the problem. This is a simple and cheap repair that can be done on 99% of all Tecumseh 4-cycle engines.
The Kawasaki carb presents a more difficult problem. The float is solid and it is not normally subject to fail. The inlet needle valve has a viton rubber tip and the seat is a machined surface in the aluminum carb body. More often then not, on an engine that old, replacing the needle will not solve the problem, the seat wears/corrodes. The leak cant be fixed, so the carb will typically require replacement. Over the years I have had some occasional successes repairing this carb by lapping the seat using a tool that I made and lapping compound.

Re: Float valve question [Re: Dave Sherman] #4577008
11/17/17 12:05 PM
11/17/17 12:05 PM
Joined: Sep 2004
Posts: 8,014
Marshfield , MA
andyd Online content
andyd  Online Content

Joined: Sep 2004
Posts: 8,014
Marshfield , MA
All my 4 stroke OPE has a shut off. I run them dry after every use. When I forget, the Suzuki/ Hitachi carb will drain the tank on the Toro.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Float valve question [Re: Dave Sherman] #4578115
11/18/17 04:17 PM
11/18/17 04:17 PM
Joined: Jan 2006
Posts: 1,181
Ohio
Dave Sherman Offline OP
Dave Sherman  Offline OP

Joined: Jan 2006
Posts: 1,181
Ohio
Got the new carb and spark plug put on the snowblower, and it started on the second pull. Looking closely at the old carb, I see a few tiny passages that make me wonder if they aren't clogged up in addition to a leaky float. Not bad for a free snowblower that only needed $20 worth of parts. A shutoff valve would be nice, but it would take some doctoring to install since the shrouds surround the engine and gas tank. We'll see how it starts next time after it sits for a little while.


2015 Honda Pilot EX AWD Valvoline 0W-20 Bosch filter
1977 MG Midget Valvoline VR-1 20W-50 Bosch Filter
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