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Why Would Fuel Flow Thru The Atmospheric Vent?


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#1 bprzyw OFFLINE  

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Posted June 08, 2014 - 07:08 AM

The carb on my 1886-01 it allowing fuel to flow (and i mean FLOW) thru the atmospheric vent hole on the carb. Ran fine day before, actually really great, sat over night, then next day went to start it up, and fuel was filling the carb to the top thru that hole....overflowing into the oil pan. Tore carb apart, everything looks just fine. I think she's a bit fickle. Sometimes she runs, sometimes she doesn't.

Thanks

Bernie

 


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#2 Chopperhed OFFLINE  

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Posted June 08, 2014 - 07:14 AM

something is holding the float valve open.

 

try a few taps arouinf the bowl with a screwdriver handle.


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#3 bprzyw OFFLINE  

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Posted June 08, 2014 - 07:25 AM

I have tried that. also pulled apart and blew thru fuel inlet, nothing gets past the needle.

Thanks


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#4 boyscout862 ONLINE  

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Posted June 08, 2014 - 07:47 AM

Is the float sinking? Is it clean? Is the fuel pump providing too high pressure?(release valve stuck) Good Luck, Rick


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#5 Bolens 1000 OFFLINE  

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Posted June 08, 2014 - 07:50 AM

Sounds like you need to get a carburetor pressure gauge  on there and totally rule out any leaks in the seat and carb.........


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#6 HDWildBill OFFLINE  

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Posted June 08, 2014 - 09:35 AM

I've got one in the shop now that fuel keeps flowing.  Tore it apart and everything looks good.  Seals are shot so I'm going to put a kit in it.  Also with the above suggestions, put a new filter on it.  It doesn't take much to hold that needle valve open.


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#7 superaben OFFLINE  

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Posted June 08, 2014 - 12:15 PM

Sounds like a fuel pump to me if the carb is working like it should.  Put a gravity feed line onto the carb and see what happens.  If it leaks then, you know it is carburetor.

 

Ben W.


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#8 GTTinkerer OFFLINE  

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Posted June 08, 2014 - 12:20 PM

Is the float sinking? Is it clean? Is the fuel pump providing too high pressure?(release valve stuck) Good Luck, Rick

If it has the metal float shake it and see if it is filled with gas, if so the float won't float also the brass floats get corroded to the point they loose their buoyancy.   I have also had plastic floats that must have deteriorated to the point they would not float.


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#9 MyBolens1053 OFFLINE  

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Posted June 08, 2014 - 12:26 PM

Have to agree with those that said either debris held the needle open or the float is failing.

 

Good luck.


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#10 bprzyw OFFLINE  

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Posted June 08, 2014 - 01:24 PM

Thanks. Took the carb off (yet again) And sure enough, the brand new float was full of fuel. replaced with old, set correctly. Put back on, and good to go. Even if its new, do not trust it. Guess another lesson learned. Huh who know you could do a card tear down blindfolded?? :thumbs:


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#11 HDWildBill OFFLINE  

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Posted June 08, 2014 - 02:10 PM

Glad to hear you figured it out.  Just because it is new does not mean it is good.  Seen that to often.


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#12 toppop52 ONLINE  

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Posted June 08, 2014 - 02:26 PM

The more Chinese, Korean, Indian, Mexican, etc... stuff you get, the less you can trust new parts, I've learned to verify every piece any more. Glad you're up and running.


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#13 bprzyw OFFLINE  

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Posted June 09, 2014 - 10:45 AM

Thanks guys............Now on to timing...........






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