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Old 14 August 2012, 09:45   #1
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Symptoms of water in fuel ?

Been out with a mate this morning in his new to him SIB with a 15 Yam on the back. ( ok ok I know I am suppoesed to have day/desk job ! )

Was fine but then started loosing power and surging & was like this for maybe 2-3 mins across the rev range , no misfire just a lack of 'go' . Cleared up for 20 mins , then came back for a few , then fine until we came back.

He stores it outside and I reckon its got water (condensation) in it and its was this that has caused it . He is adamant it wont have water in it.

I've always run with seperators so have never had the problem of water, but it seems to make sense to me.

Any comments / suggestions ?
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Old 14 August 2012, 10:28   #2
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i fink yor fute waz onn de petril hoze
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Old 14 August 2012, 10:37   #3
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Run it on a remote tank with "clean" fuel and see if the problem persists?
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Old 14 August 2012, 11:09   #4
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Portable fuel tank? Empty it and take a look.

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Old 14 August 2012, 12:49   #5
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Usually a bright flashlight into the tank shows if there is water or not. Also drain the carbs into a clear glass container, and again look for water. Often water is very obvious.
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Old 14 August 2012, 13:17   #6
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Originally Posted by Peter_C View Post
Usually a bright flashlight into the tank shows if there is water or not. Also drain the carbs into a clear glass container, and again look for water. Often water is very obvious.
petrol vapour + potential for spark !

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Originally Posted by PeterM
...new to him SIB with a 15 Yam... He stores it outside and I reckon its got water (condensation) in it ...
unless it came with water in it, or he's left the vent open in a position that gathers rain I'd guess it probably isn't water. It takes a long time sitting in quite cold conditions to generate enough condensation to cause a problem; its minimised with plastic tanks, keeping the vent sealed and keeping the tank close to full.

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Was fine but then started loosing power and surging & was like this for maybe 2-3 mins across the rev range , no misfire just a lack of 'go' . Cleared up for 20 mins , then came back for a few , then fine until we came back.
I've never had water in my fuel, but that isn't what I would expect - i'd expect it to die completely and probably not recover until fresh fuel or carbs drained etc.

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i fink yor fute waz onn de petril hoze
There speaks the voice of experience. And I think you might be on to something though...
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Old 14 August 2012, 13:53   #7
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petrol vapour + potential for spark !
Ummm...who buys flashlights that aren't completely sealed and waterproof? All mine are double o-ringed. Spark is a non issue.

Quit a few good points made though. What about something stupid silly like not opening the vent cap? Not that I have done that less than twice

Drain the carb and see what comes out!

FWIW storing fuel tanks full is the best way to keep condensation from forming inside and letting it drip into the gasoline.
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Old 14 August 2012, 14:13   #8
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It doesn't even need to condensation or changing temperatures, the added alcohol will naturally absorb water from the atmosphere. And fuel sometimes comes with contaminated with water from the pump. Or could be old fuel too.
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Old 14 August 2012, 15:24   #9
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Usually a bright flashlight into the tank shows if there is water or not. Also drain the carbs into a clear glass container, and again look for water. Often water is very obvious.
Or fit a Racor filter with a clear bowl, no torch needed & you can see & drain off the water before it gets to the engine
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Old 14 August 2012, 18:47   #10
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Thing is has cleared itself....so I won't be trying to see into his tank by the light of a match. It's not the vent or me sat on the pipe.

I did drain the carb.bowl and our looks clean. Emptied the track and it had the smallest, like half a teaspoon of water In it. Just I really can't of what would cause the surge in a two stroke carbed engine.

It has to be fuel....any way the fuel pump could do this and create the symptoms?
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