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Long-term storage with a dry carburetor

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Sam (Mo.)

01-09-2001 23:54:45




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Continuing a discussion from the other day, and maybe a little bit off topic - I have been bad in the past about storing all kinds of equipment with gas in the carburetor, the gas eventually evaporates there, it forms varnish, and it gums everything up. I'm fixing that now - I'm in the process of cleaning up all my equipment and adding fresh gas with stabilizer. With both 8N's I have stabilized the gas and used the fuel shutoff valves to park them in the barn with dry carburetors.

The off-topic part: Today I mentioned to a local small engine mechanic that I was thinking of adding an in-line fuel shutoff valve to my bass boat (40 h.p. Johnson outboard with built-in gas and oil tanks) so I can run it out of gas at the lake at the end of each fishing trip - storing it with a dry carb. between trips. He said he's been thinking of doing the same with his boat BUT he's afraid it may not be a good thing to do with an oil-injected motor! My boat has a separate tank for outboard oil, and the oil gets mixed with the gas as its used.

So, does anyone here know for sure? Would it be O.K. to install a shut-off valve and run the motor out of gas before taking it out of the water? I'd sure like to do that if I can without damaging anything. Thanks, - Sam

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chuck

01-10-2001 04:36:58




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 Re: Long-term storage with a dry carburetor in reply to Sam (Mo.), 01-09-2001 23:54:45  
Sam, For the last 15 years I have been storing my 175 Mercury outboard with gas in its carburetors. About 5 years ago one of them started overflowing so I took all of them off (3 two bbls) and took them apart to clean them up. What I found is that there was a small piece of black material stuck in the needle of the one that was overflowing. As far as evidence of evaporating fuel leaving varnish inside the carbs-none that I could see. I cleaned them with carb cleaner and very little came off. I would say ten years (with stabilizer in the gas 8 of the ten years) of 5-6 months of storage didn't cause any significant varnish buildup. I don't worry about it anymore. I leave gas in the carbs of my two chainsaws, 5 dirt bikes, 1 boat, 1 weed wacker, a couple of cars that get little use in the winter, and my 52 8N. I am also a bad boy and don't close the fuel shutoff valve on the 8N every time I leave it. I have not had a problem in 13 years. I did this with original carb and the new Zenith that is on it now. The tractor gets used 1-5 times a week.

chuck
436244

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ZANE

01-10-2001 06:04:11




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 Re: Re: Long-term storage with a dry carburetor in reply to chuck, 01-10-2001 04:36:58  
I go with Chuck! I just wish I had been using fuel stabilizer years before. I just bough my first stabilizer a few weeks ago. I am planning to use it one everything I can think of when I refuel it.

I would not run any two cycle engine dry of fuel. Even if it has direct fuel injection. I work on a good many two cycle engines and lots of times if the engine runs out of gas while laboring it will cause the piston gauld or melt a hole in the top because of too lean a mixture.

I had an ultralite airplane and it even had a one way clutch on the propeller drive so that if you were decending from altitude the engine could not be turned by the propellar windmilling on the way down because if it did the lack of lubrication when at closed throttle would gauld the pistons. When this condition is encountered in an ultralite I can assure from experiance it will get your undivided attention!

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Paul - Pine Island MN

01-10-2001 03:38:21




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 Re: Long-term storage with a dry carburetor in reply to Sam (Mo.), 01-09-2001 23:54:45  
Sam: My system on my Merc mixes at the oil tank and feeds mixed fuel up a line that connects to the motor. The gas is mixed with oil based on the engines demand for fuel (the line is not pressurized) so that line can be disconnected without affecting the mixture of what the engine sees now or on restart. If the fuel is not supplied to the engine mixed I'd e-mail the company and ask the engineers for their opinion.

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