flushing your engine
Submitted by Fish guts on Sun, 2013-09-22 16:54
just curious. when flushing your engine. does anyone disconnect the fuel line while flushing so fuel drains out the carbbies? i often do that but i have been experiencing fuel surging issues of late. i have changed fuel filter and always have full tanks when i head out. doesnt seem to be sucking air and only does it every now and again. only thing i can put it down to is disconnecting the fuel line when i flush the engine. i have an 1998 (or there a bouts) Toshatsu. any thoughts?
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Vinesh87
Posts: 2751
Date Joined: 02/04/11
I never disconnnected the
I never disconnnected the fuel line on my old tohatsu ( 1983) unless i wasnt going to be using it for a few months. Never had any issues. I now have a new Tohatsu that i will be running the fuel out of as its a motor i wont use too much!
What do you mean by fuel surging ? Motor spluttering or ?
Shane O
Posts: 926
Date Joined: 22/01/10
always
always disconneted the feul line on my 55hp tohatsu, was a 1980's model. never did at first, and had those problems.
makai
Posts: 459
Date Joined: 28/10/08
I disconnect
I have heard arguments for and against. Some argue leaving a carbie full of two stroke and having it evaporate and leave behind an oil residue creates a problem. Others say better to have some fuel in the carb to stop the alloy bowl oxidising. If you are using the motor frequently then its probably not an issue either way, but I disconnect and run mine dry as it sits idle for long periods.
You would also be amazed at how little it takes to clog a carby jet. I have had issues before when I could not get full revs. After checking fuel supply, changing the plug, and adjusting mixture screws, and doing everything else I could think of, I finally pulled the carbie off. It appeared to be spotless, but I gave it a thorough clean it with carbie kleen anyway and problem immediately solved!
opsrey
Posts: 1200
Date Joined: 05/10/07
Consider the aspect of lean fuel burn.
I'm not sure how damaging it is but running the carbie dry causes a lean fuel mixture just as the carbie runs out of fuel. This is noticeable by the increase in engine rpm followed by the engine cutting out.
So the question remains - how much oil is on the bearings and sleeves just as the revs pick up?
Like I said, I don't have the answers. Had a blue band 10hp Merc which I tried both methods on. Could never settle at an answer.