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Seafoam / Carb Cleaner

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I have a 40 hp Merc that hasn't run since November(gas left in tank with no treatment). Put muffs on and started engine with no problems but it wont run at idle. After starting, I can get down to approximately 1000rpm before motor kills. I would like to try running Seafoam Motor Treatment to see if this will correct the issue without having to tear anything down to resolve this issue. Any advise is greatly appreciated.
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Re: Seafoam / Carb Cleaner
get a second 5 gallon tank add 2-3 gallons of gas and one can of seafoam and do a shock treatment. I do this every couple of years. It will smoke badly.
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Re: Seafoam / Carb Cleaner
Thanks Samari.
I was planning on adding Seafoam to my tank due to not really knowing if the gas tank it self may need cleaning/attention as well. After adding new gas on yesterday, I'm at approximately 3/4 full (7.5 gal tank). So I shouldn't be surprised or afraid when I see lots of smoke? I would like to try this and run it for about 10 - 15 minutes intervals until I empty the tank and start with fresh gas(no ethanol)mix. Any advise is appreciated.
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Re: Seafoam / Carb Cleaner
...Mercury used a rubber diaphragm and two small dime size intake and out-take screens in the gas pump for years...the rubber dries-out and cracks when stored and the screens get clogged w/varnish...there is also a screen filter in the tank that can get clogged...remember rust under gas cap gets washed back when tank is full...it's the beginning of a new clog...check your manual ...cheers

PS...Mercury was faster w/a shorter stroke but always more complex...Johnson and Evinrude seem to use more 'easier' engineering ??? UGH ???
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Re: Seafoam / Carb Cleaner
Thanks A.R.

I'll remember to take a look at this if a little tear down is necessary to fix issue. If these parts are easily accessible, I'll look into checking these parts and changing. If not the issue,just for piece of mind. Thanks for the advise.
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