Posted by Janicholson on October 02, 2009 at 07:07:07 from (199.17.6.222):
In Reply to: Re: fuel leak on M posted by nydolphin on October 02, 2009 at 06:16:06:
The needle/seat Rusty refers to is the internal valve attached to the float inside the bowl. The load adjustment(front bottom of carb)you refer to is not it. The original seat and most replacement seats are brass. Original needles were also brass. Over the years the needle wears into the brass seat, deforming both to an ever wider contact area. Eventually this leaks, allowing fuel to overflow the bowl. The new needles are often made from Viton (a relitive of neoprene with a harder compound) These will often work well, but have been known to have molding marks on them that can weep fuel slowly. Most do not, but when they do it is frustrating. With the bowl off gently holding up the float and turning on the fuel will allow you to see directly the rate of leakage, and how much light pressure it takes to stop it.
The needle/seat should not leak, and the fuel shutoff as described (sediment bowl) should be replaced to allow real control every time it is shut off. JimN
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