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Garden Tractors Discussion Forum

Gasoline in crankcase-BS 21HP

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da.bees

10-03-2017 11:55:17




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B&S Model No. 461707-0145-E3 twin cyl 21HP Origional equipment on Craftsman Lawn Tractor 917-271840
Fuel tank beneath operator's seat was obandoned and replaced by a tank on hood well above level of carburetor. Engine ran well for several months without any problem. When 1/2 gallon of fuel is poured in tank it will now go from tank to crankcase within 2 or 3 hours. Is there a way of knowing which is at fault, needle and seat or fuel pump?

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Married2Allis

10-04-2017 10:44:26




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 Re: Gasoline in crankcase-BS 21HP in reply to da.bees, 10-03-2017 11:55:17  
Oil diluted with fuel can also leak past the crank seals making you think your seals are shot.



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tractorguy2

10-04-2017 07:22:11




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 Re: Gasoline in crankcase-BS 21HP in reply to da.bees, 10-03-2017 11:55:17  
If you moved the fuel tank and it's now higher than the carburetor. You don't need the fuel pump. You can remove it completely.



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Mule Meat

10-03-2017 21:10:37




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 Re: Gasoline in crankcase-BS 21HP in reply to da.bees, 10-03-2017 11:55:17  
AS T.R.K. stated..

Could very well be the fuel pump.

Remove the pulse tube (rubber hose from the pump to engine block) from the pump.

Let it sit awhile and look for signs of fuel running out of the pump from the pulse tube.

If you notice signs of fuel the rubber diaphragm inside of the fuel pump is bad and allowing fuel to flow into the crank case through the pulse tube once the engine is shut off..

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t.r.k.

10-03-2017 18:48:00




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 Re: Gasoline in crankcase-BS 21HP in reply to da.bees, 10-03-2017 11:55:17  
You can check the fuel pump, disconnect the hose that goes to the engine crankcase. If its a twin cylinder, it connects to a valve cover, if its a single cylinder, it usually connects to the dipstick tube. put gas in the tank, If gas comes out the nipple on the pump, or the hose from the pump, you need a fuel pump.

It is very rarely the fuel pump.

You can also disconnect the carburetor from the manifold, hold or support it in its proper orientation like it was still on the engine. Put fuel in the tank. If fuel drips out the throat of the carburetor, the problem is the needle and seat (or the o-ring above the seat, if its a Nikki carburetor.) In some of the carburetors, the seat is not replaceable and if a needle does not fix it, you will need a new carburetor.

In the lawnmower shop, I usually specify a new carburetor, it is much more likely not to come back on me if I just replace it.

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da.bees

10-03-2017 23:34:50




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 Re: Gasoline in crankcase-BS 21HP in reply to t.r.k., 10-03-2017 18:48:00  
Thanks a million t.r.k. That's exactly the information I need. The condition my body has got into every minute I save from stooping over to work on things is important.



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jeffcat

10-03-2017 20:12:54




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 Re: Gasoline in crankcase-BS 21HP in reply to t.r.k., 10-03-2017 18:48:00  

You are right on about the Niki carbs. The ones on Ebay are around $65.oo and are fabulous. Dont even bother trying to fix one. The new ones are a third revision and are great.



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Texasmark1

10-17-2017 03:09:51




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 Re: Gasoline in crankcase-BS 21HP in reply to jeffcat, 10-03-2017 20:12:54  
Amen brother. Jeffcat speak truth! Buy carb! Will love self. Grin

⅛ Cherokee.

Mark



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steve_in_mo

10-03-2017 12:36:19




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 Re: Gasoline in crankcase-BS 21HP in reply to da.bees, 10-03-2017 11:55:17  
Needle and seat. The fuel pump is supposed to allow fuel flow without the engine running.
Put a shutoff vale in when you replace the needle and seat, like a belt and suspenders.



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da.bees

10-03-2017 15:59:22




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 Re: Gasoline in crankcase-BS 21HP in reply to steve_in_mo, 10-03-2017 12:36:19  
"The fuel pump is supposed to allow fuel flow without the engine running." I don't understand what you mean by that statement. Wouldn't that have the same effect as a leaking needle & seat?



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steve_in_mo

10-04-2017 12:13:00




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 Re: Gasoline in crankcase-BS 21HP in reply to da.bees, 10-03-2017 15:59:22  
No. The valves in the pump allow fuel to flow through the fuel pump whether the engine is running or not.
You'd have to take a fuel pump apart if you need visuals. With luck you might find a yourtube video.



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Bob

10-03-2017 18:22:55




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 Re: Gasoline in crankcase-BS 21HP in reply to da.bees, 10-03-2017 15:59:22  
Fuel can always flow through the fuel pump by gravity to the carburetor. Your issue is with the carburetor float/needle and seat.



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