Accidentally left the petcock on for 5-7 hours last night, what do?

  • kz750spectre
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07 Jun 2023 06:27 #885731 by kz750spectre
Greetings all and good morning,

On my KZ750 I have been running the petcock on "RES" only. This is because I have the vacuum port on the petcock capped off. Which works all fine and well, but I mistakenly left the fuel on the other night for what I estimate to be 5-7 hours. I came back to the garage and smelled gas, it was leaking and dripping from the bottom of my carbs. I know the engine isn't hydrolocked with gas or anything because I started it and let it run for a few minutes with the fuel off. Should I be worried about contamination of the oil with gasoline? Would this amount of time left open be harmful? I just changed the oil with Rotella T6 and it only has about 100 miles on it.

Thanks much,

-KzJM

-KzJM

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07 Jun 2023 06:40 #885733 by Wookie58
Has the oil level risen? does the oil smell of fuel? Is there fuel in the airbox? I would suspect you will be ok
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07 Jun 2023 10:47 #885739 by kz750spectre
I accidentally slightly overfilled it during my oil change, so I can't tell if it is higher than normal. It has K&N filters so it has no airbox at the moment.

-KzJM

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07 Jun 2023 11:44 #885742 by Franklin
If I'm not mistaken gas will float on top of the oil. You could take the oil cap off and smell for gas, also syringe or suction tube some oil out since you overfilled it anyway. Try to suction from the very top; if gas is there you might be able to pull some out. If no evidence of gas that's good.

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  • Scirocco
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07 Jun 2023 12:14 #885743 by Scirocco
No, Franklin. Gas will mix and diluted the engine oil, like a pre-mix 2-stroke fuel.
Water will not mix and flow at the bottum and oil on top.

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07 Jun 2023 13:22 #885746 by sf4t7
IMO, better safe than sorry - replacing the oil would be cheaper than possibly screwing up your engine.  Then you won't be worrying about it whenever you ride.

Scotty


Scotty

1974 Z1A
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07 Jun 2023 14:42 #885748 by kz750spectre

IMO, better safe than sorry - replacing the oil would be cheaper than possibly screwing up your engine.  Then you won't be worrying about it whenever you ride.

Scotty

 
You are right. I guess I'm going back to Walmart to get me some of that sweet sweet Rotella T6

-KzJM

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07 Jun 2023 15:23 - 08 Jun 2023 06:39 #885749 by Franklin
"Scirocco post=885743 userid=48181
No, Franklin. Gas will mix and diluted the engine oil, like a pre-mix 2-stroke fuel.
Water will not mix and flow at the bottum and oil on top."

I think as long as engine wasn't run to mix them, the gas is lighter and will stay on top. I just did a little experiment, poured some oil in a jar, then some gas on top. The clearer gas stayed separated on top of the oil, it was obvious they didn't mix very much.

Edit: I missed that he had started it already. In that case I agree oil should be changed.
Last edit: 08 Jun 2023 06:39 by Franklin.

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07 Jun 2023 15:44 #885751 by Wookie58
Can you smell gas in the oil? I suspect most came out of the carb overflows - if you are concerned, the price of a can of oil is cheap "peace of mind"

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08 Jun 2023 05:19 #885765 by blipco
I can’t think of anything better to mix gas and oil than a rotating crankshaft. 
Change the oil and install a manual shutoff in the line. If I have it right, no vacuum fuel tap ever has an 'off' position.

"Swim against the current, even a dead fish can go with the flow"-somebody (I forget Who)

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08 Jun 2023 07:00 #885771 by MLMG
But the oil level went up?

1977 Kawasaki KZ1000 A1

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08 Jun 2023 07:31 #885775 by ckahleer
His problem is he doesn't have a vacunm petcock. If a bike I acquire dosen't have one, I install one and seldom touch it, just leave it in the ON position all the time.

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