Stuck float

[twangin4u]

Can a stuck float actually allow gas to run into cylinder and seep past poison rings into crank case?

[racerrad8]

Yes

Randy - RPM

[twangin4u]

That's what I thought. That probably not a good thing at all for the cylinder or bearings.

[FJmonkey]

That's what I thought. That probably not a good thing at all for the cylinder or bearings.

Possible hydro lock and major engine damage??? Check your oil for fuel...

[fj1289]

Can a stuck float actually allow gas to run into cylinder and seep past poison rings into crank case?

Do you still have the air box?  Fuel can also back flow into the air box and drain down thru the crankcase breather tube and directly onto the case. 

[twangin4u]

Ya I noticed fuel dripping out from between the carb and the airbox. My oil level is much higher now too. Luckily I haven't ran it since it's leaked. I'll just drain the oil and replace when I get the carbs straightened out

[Pat Conlon]

Consider buying a new petcock.

With your engine off, no vacuum, that petcock should not let any gas thru to your carbs.

[giantkiller]

Mine actually over flowed the crank case. Then switched to manual petcock.

[Mark Olson]

Yes , the petcock is probably leaking . Caused bent rods for the PO of my FJ.

[jscgdunn]

I spent most of the day fighting a bad or stuck float...had carbs on and off three times.  Thank God for pods!   After rechecking float heights, replacing needle/seat O-rings, I started it up without and noticed fuel in puddleing in the bottom of of #4 carb below the slide....and of course leaking out the overflow.  Went to my parts set and took a float out and replaced the float in #4.  Leak stopped.  I cannot see any damage to the one I removed.  Do they sometimes get "gas-logged"?  New one on me.

[FJmonkey]

All things can and will eventually fail. The ones destine to fail after we are done with them (past our life time) never get noticed. Good catch.

[Pat Conlon]

...... I cannot see any damage to the one I removed.  Do they sometimes get "gas-logged"?  New one on me.

Hey Jeff, did you do the water test?
Put the float in a bowl of water. Weight the float so it stays submerged at the bottom.
Let it sit for a couple of days. Take it out and shake it. Do you hear or feel any water sloshing inside?
Then you have a leaky float.

Sometimes the surface of the tab on the float can be worn from the float needle. Noel has a good picture of this. Polish out the burr on the float tab.

Cheers

[ribbert]

...... I cannot see any damage to the one I removed.  Do they sometimes get "gas-logged"?  New one on me.

Hey Jeff, did you do the water test?
Put the float in a bowl of water. Weight the float so it stays submerged at the bottom.
Let it sit for a couple of days. Take it out and shake it. Do you hear or feel any water sloshing inside?
Then you have a leaky float.

Cheers

Pat, that's a good tip but it needs to be submerged in fuel, or some other "thin" spirit, not water. Fuel will pass through openings that water won't.

Perforated brass floats are spoken about far more than they are experienced but I have seen plastic ones split at the seam.

Noel

[Pat Conlon]

Ok, very good point Noel, thank you. Do you have that picture to show us of your fix on the float tab?

We really need to put that in the Files.

[ribbert]

Do you have that picture to show us of your fix on the float tab?

We really need to put that in the Files.

Noel