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#4579511 - 11/19/17 09:11 PM Salt water in gas
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4838
Loc: Houston, Texas
I got my boat running that sank, so I pumped out the gas. I have about 20 gallons of it. Can I filter out the water and put it back in? I'm a little worried about it being salt water.
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#4579517 - 11/19/17 09:15 PM Re: Salt water in gas [Re: motor_oil_madman]
E150GT Offline


Registered: 03/11/12
Posts: 1091
Loc: San Antonio, TX
There’s funnels that filter out water in gas. Works pretty wel.
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#4579518 - 11/19/17 09:15 PM Re: Salt water in gas [Re: motor_oil_madman]
4WD Offline


Registered: 09/21/10
Posts: 6351
Loc: Texas
Some fire departments will take bad gas and use in training fires …

I would not try to use it myself …

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#4579570 - 11/19/17 09:57 PM Re: Salt water in gas [Re: motor_oil_madman]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Go buy a Mr. Funnel from O'Reilly auto parts.

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#4579646 - 11/19/17 11:52 PM Re: Salt water in gas [Re: motor_oil_madman]
lbhsbz Offline


Registered: 02/09/12
Posts: 30
Loc: Long Beach CA
What type of gas? If non-ethanol, yes. Let it separate out, pull the gas off the top and pour it back in the tank.

If you were using fuel that contained ethanol...it's different. Ethanol mixes with water much better than it mixes with gasoline, and any water in the fuel will draw the ethanol out of solution with the gasoline, so what separates out is only gasoline, but of a considerably lower octane grade now that it's lost it's ethanol. If you run the boat on 87, I might add 5 gallons of your recovered fuel to 20 gallons of fresh 91 out of the pump, but aside from that, I'd use it to kill weeds.

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#4579659 - 11/20/17 01:16 AM Re: Salt water in gas [Re: motor_oil_madman]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
They come in different sizes. Gasoline and water goes in -- Gasoline comes out.


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#4579684 - 11/20/17 03:48 AM Re: Salt water in gas [Re: Merkava_4]
4WD Offline


Registered: 09/21/10
Posts: 6351
Loc: Texas
I use one of these to fill my skiff ~ what is considered the “sump” to catch heavier “free water” is quite small. I think it’s great as a precaution ~ but not sure how well it will work a high percentage of water in 20 gallons …

Salt water belongs under the boat ~ not in a tiny sensitive fuel system on the motor …

Do you have a Racor filter ahead of engine fuel filter …

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#4579693 - 11/20/17 04:33 AM Re: Salt water in gas [Re: motor_oil_madman]
Claud Offline


Registered: 02/11/14
Posts: 593
Loc: Margate England
How much does 20 gallons cost?. Is it worth risking your engine for?.

Claud.

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#4579765 - 11/20/17 06:41 AM Re: Salt water in gas [Re: motor_oil_madman]
Virtus_Probi Offline


Registered: 06/25/15
Posts: 3966
Loc: New England
I'm not sure how dissolved salt could be filtered easily...I'd definitely be concerned about that crystallizing out in the combustion chamber.
Isn't that why people put sugar in the gas tanks of their enemies?
Might be some chemical approach that could work to get that stuff out, but aren't we talking about less than $100 worth of product unless this is some special marine gas?
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#4579798 - 11/20/17 07:27 AM Re: Salt water in gas [Re: Claud]
SilverSnake Offline


Registered: 05/29/13
Posts: 590
Loc: Florida
Originally Posted By: Claud
How much does 20 gallons cost?. Is it worth risking your engine for?. Claud.


Good thinking. Can't believe anyone would even consider putting the fuel back in.
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#4579813 - 11/20/17 07:48 AM Re: Salt water in gas [Re: motor_oil_madman]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
Lets see...20 gallons at $2.50/gal is $50.

So, as long as you boat engine is only worth $50 then why not? Oh wait, the funnel is another $10 so as long as your engine is only worth $40.

Seriously though, I would not even dream of doing this and I have RACORS.

And as was mentioned above...saltwater behaves differently than fresh water in filters.

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#4579839 - 11/20/17 08:32 AM Re: Salt water in gas [Re: motor_oil_madman]
motor_oil_madman Offline


Registered: 11/29/09
Posts: 4838
Loc: Houston, Texas
I forgot salt water has more buoyancy or whatever.
_________________________
2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.


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#4579972 - 11/20/17 11:00 AM Re: Salt water in gas [Re: Claud]
WyrTwister Offline


Registered: 01/13/13
Posts: 1488
Loc: Texas
Originally Posted By: Claud
How much does 20 gallons cost?. Is it worth risking your engine for?.

Claud.


Pretty much what I was thinking .
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Wyr
God bless

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#4580092 - 11/20/17 01:16 PM Re: Salt water in gas [Re: motor_oil_madman]
gathermewool Offline


Registered: 01/09/09
Posts: 5986
How many gallons of fuel was in there before it sank vs after?

I wouldn't even consider using that fuel. Water and fuel will separate, that's true, but your remaining fuel will have high chloride, which will cause additional corrosion and other unforeseen issues, such as plating out in high temp areas.

Originally Posted By: motor_oil_madman
I forgot salt water has more buoyancy or whatever.


Salt water is heavier. That's why people float higher when swimming in the dead sea - high salinity.

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#4580126 - 11/20/17 01:59 PM Re: Salt water in gas [Re: Claud]
Merkava_4 Offline


Registered: 01/30/07
Posts: 17501
Loc: Clovis, CA
Originally Posted By: Claud
How much does 20 gallons cost?


20 x $2.899 = $57.98

Mr. Funnel AF3CB from Amazon = $22.98

https://www.amazon.com/Mr-Funnel-AF3CB-Fuel-Filter/dp/B000SOIRCG

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