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Garden Tractors Discussion Forum

Briggs float needle leaking

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11-29-2017 20:53:10

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Craftsman LT1000 917.271840 W/21HP Briggs,carb#693479 Origional tuel tank beneath seat leaked so I mounted another small tank on hood. Engine started running rich and flooding. I replaced the float needle and fuel pump diaphragm but flooding continue's. I didn't notice a way to renew seat for needle. My questions. Do'es raising tank above carb increase pressure that fuel pump supply's against needle? Should needle seal well enough to hold added pressure if it is indeed more than it was origionally?

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11-30-2017 19:22:46

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 Re: Briggs float needle leaking in reply to da.bees, 11-29-2017 20:53:10  
Thanks everyone,as suggested,I polished the seat and the leak stopped.

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11-30-2017 11:21:34

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 Re: Briggs float needle leaking in reply to da.bees, 11-29-2017 20:53:10  
You could have dirt in your fuel tank. Or your new needle doesn't mate with the seat. My B&S shop says to use toothpaste as a grinding compound to mate the two surfaces. I use a small fuel line hose and stick it over the end of the needle for a spinner handle.

If the side walls of the seat have groves wore from the up and down movement of the needle. The needle will not seat correctly and the carb will need replaced.

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11-30-2017 09:02:47

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 Re: Briggs float needle leaking in reply to da.bees, 11-29-2017 20:53:10  
to answer your question, yes height does matter. The higher the tank is, the more pressure on the needle valve.

That said, if its only an additional foot or so, it should not make a difference. The fuel pump can develop 1 to 2 psi, itself.

I don't have a parts book close-is this the carburetor with the plastic seat and float assembly in it? If so, renew the little o-ring around the seat/between the seat assembly and the carburetor body. If that o-ring is cracked, gas completely bypasses the seat.

If the seat is in the carburetor body itself, lap the seat using a Q-tip. I wouldn't use the new needle because you may damage it and that would compound your original problem.

Also, some of those carburetors are available aftermarket very reasonable priced.

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11-30-2017 10:07:11

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 Re: Briggs float needle leaking in reply to t.r.k., 11-30-2017 09:02:47  
The reason I'm trying to salvage carb is because new is over $200 on Ebay. Thanks for the tips on dressing the seat. I hadn't tried it before because I feared damaging the viton needle tip.

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11-30-2017 03:45:27

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 Re: Briggs float needle leaking in reply to da.bees, 11-29-2017 20:53:10  
The needle seat must be corroded or gummed up. Soak the seat area with carb cleaner for a while. Them with the carb off, dab a mild abrasive like comet in the seat then take the new needle and rotate it back and forth in the same manner as you would lapping valves. Then flush the carb out completey.

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