Water in fuel or not?  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> RC Fuels >> Water in fuel or not?
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Water in fuel or not? - 11/8/2002 8:58:34 AM   
Bill Mixon


 

Posts: 259
Joined: 8/24/2002
From: Kite, GA,
Status: offline 		Hi,

I have noticed that at the bottom of a gallon of 15% Omega fuel there are drops settling. Look to be water drops, but I thought that the nitro absorbed the water and would not be visible.
So, is it water or something else?

Bill
       Post #: 1

Water in fuel or not? - 11/8/2002 7:09:21 PM   
downunder-RCU



Posts: 1125
Joined: 12/27/2001
From: Adelaide, South Australia
Status: offline 		It's something else but I wouldn't even guess as to what it might be. Nitro doesn't absorb water very well (in fact it'll only absorb up to 2.5%) but methanol just loves it.

(in reply to Bill Mixon)
       Post #: 2

Fuel - 11/8/2002 8:28:13 PM   
Bill Mixon


 

Posts: 259
Joined: 8/24/2002
From: Kite, GA,
Status: offline 		Humm..

Could it be then that the fuel has absorbed so much moisture, or whatever it is that it can't hold anymore?
Note that this is gallon that is almost empty about 1/4 full. I have had this to happen on the last couple of gallons of fuel. I keep the jug sealed up at all times and I don't pump fuel back into it. The only time the jug is ever opened is when I open a new one to put the cap with the fuel pump hooked to it, and when the jug is empty. And of course when I open the line to fill the plane.

I'm going to see if I can get these drops out of the jug separate from the fuel and find out what they are.

BTW, I forgot to mention that this is what I believe is causing some trouble with my engines. Engines have been quiting at idle or when run for a while and brought back to idle. I hope this is the problem because if it's not I've got two bad engines.

Bill

(in reply to Bill Mixon)
       Post #: 3

Water in fuel or not? - 11/9/2002 5:37:35 AM   
downunder-RCU



Posts: 1125
Joined: 12/27/2001
From: Adelaide, South Australia
Status: offline 		Methanol will absorb water right up to the point where it's 50/50 methanol/water. From there on it becomes water/methanol In other words there's no limit.

But one thing I've found is that once you get to a certain % of water then the oil begins to seperate out of the mixture. It's temperature dependant but on a normal mild day it happens at about 3 to 4% water.

(in reply to Bill Mixon)
       Post #: 4

Fuel - 11/9/2002 7:35:42 AM   
Bill Mixon


 

Posts: 259
Joined: 8/24/2002
From: Kite, GA,
Status: offline 		That's interesting.

I tried to get a sample of the liquid in the bottom of the jug today, but there was only a small amount visible. A lot less than yesterday and it was also warmer today. The small bit that I did get however seemed oily.
If so then when in the fuel tank, the drops of oil could have been enough going through the engine at idle that the oil was killing it.

What is your opinion on fuel storage downunder?
I don't know what else I could do (that is practical) to prevent any moisture from getting in the fuel. One thing that I'm going to do is cut the pickup line off so that it is about an inch off the bottom of the jug.

Thanks

Bill

(in reply to Bill Mixon)
       Post #: 5

Water in fuel or not? - 11/9/2002 7:24:22 PM   
downunder-RCU



Posts: 1125
Joined: 12/27/2001
From: Adelaide, South Australia
Status: offline 		About all you can do as far as storage is to make sure that the container is airtight. Also if you store it in a room with little temperature change then it won't breathe as much if it's not completely sealed.

It sounds like you've got your fuel in a clear container so if you see those drops you could put the container under the hot water tap to warm the fuel slightly and chances are those drops will disappear until it cools down again.

(in reply to Bill Mixon)
       Post #: 6

Fuel - 11/10/2002 5:53:36 AM   
Bill Mixon


 

Posts: 259
Joined: 8/24/2002
From: Kite, GA,
Status: offline 		Thanks for all your help Downunder..

Regards

Bill

(in reply to Bill Mixon)
       Post #: 7

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