I have a slightly old lawnmower that is leaking petrol (prob about 10yrs old). I have started it a few times recently, so it definitely works, however it leaks petrol out of a 2mm hole in the carburetor. What is this hole? It is a machined hole, not a crack or anything. I'm guessing it has something to do with air intake, but petrol leaks out of it. And now the mower won't start? Could the engine be flooded? All help is gratefully received!
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I found a break down of the carby and I am wondering if the needle has been correctly assembled back to the float tang
there should be a small spring that attaches the needle to the float with a smaller in in the end of the needle that is coil spring loaded
This set is to provide a manual release of the needle of the seat when the fuel level falls and so prevents sticking and the coil spring arrangement is to prevent the needle allowing fuel in from the ripples in the fuel as it vibrates
Yes you bought a new carby and it ran well
However there may have been a hair in the fuel and that caused a problem that you sought to fix by taking it to a garage rather that a mower repair shop
garage mechanics seldom have an intimate knowledge of small engines and so reassembly of the carby may miss setting the needle to the float correctly
As to fuel gums etc , I would discount that as it is not old enough and left sitting long enough for that to occur
fuel left for long periods (6 months or more ) does deteriorate but an fuel stabilizer additive ( from any auto spares shop) will overcome that problem
My suggestion is that you fit an inline fuel filter to the tank hose and have the carby inspected by a honda small engine ( mower shop) to ensure that it is as was originally purchased
try changing the spark plug. if that doesnt work check the fuek lines for hole and leaks, check the fuel filter and clean if necessary. remove the carbuerator and inspect the gasket; it should be soft and flexible, if it seems hard or brittle replace it. clean the carb with carb cleaner sray (available at any local auto parts store) and compressed air. make sure you get inside the small fuel rail holes. also check the primer bulb for pin holes and proper seating/seal.