Mariner 2.5HP 2-stroke leaking fuel

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This normally reliable engine has been laid up ion the shed for more thabn 12 months. Dragged it out and put it in the wheelie bin for a run-up tonight, but when I switched the fuel on it started to leak fuel from the carburettor.

As far as I can tell the fuel is coming out round the flange where the top of the float bowl bolts on to the rest of thecarburettor.

Here's a pic of the same carb (I think)

carurettor.jpg
I am guessing this means the float is stuck and is not coming up and cutting off the supply of fuel, though I am surprised that the flange/gasket is so leaky.

Am I right and what should I do?


- W
 
Nothing will be resolved until the carb's removed and the bowl separated to have a look inside. These are very simple items, as I'm sure you're aware. As you say, it's been unused for awhile, so possibly just needs a small fiddle around of the bits that move to get them moving again.
Obvious precautions taken with the open fuel hose etc., and dismantling in a controlled environment, or in a washing basin to retain the bits that come apart. I've had one of these apart, and it's easy peasy.
 
Yes, I think you're right that the float's stuck, and think you'll find dirt or gel causing the needle to stick. I doubt that the gasket's leaking though, more likely coming out of an orifice but finding it's way down to the flange.


edit, as @jamie N says, dead simple to strip. Just be patient with the throttle slide reassembly.
 
I would also guess the same. I have the 3.3hp version that's virtually identical if you ignore the Forward/Neutral lever and lower part of the leg. I had a similar problem years ago and solved it by dismantling the carb., cleaning it and putting it back together. No sign of anything wrong but it worked perfectly since that time.

Might be interesting if I get around to using it in 2022 after 2.5 years in storage.
 
Yes, Probably the Needle valve which is attached to the top of the Float is sticking. I had one where the needle had some sort of deposit built up and it started to stick. Strip the carb and and clean all parts and jet with Carb Cleaner from Auto Store. Very simple carb to strip and re assemble. the gaskets are very durable and if you are careful with it you should not have to replace.

Kinsale 373
 
Exactly the same thing happened to my SUZUKI 2.2 after its inactivity for more than a year.
The culprit was the needle float in the float chamber, this was stuck open allowing fuel to continuously flood into the chamber and out through the overflow.
A strip down and clean solved the problem.
 
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