Fuel Additives

What is a good fuel treatment to get rid of water in the gas tank.

Re: Fuel Additives

Ethanol treatment. Pick your poison as the rest of it is advertising.

Re: Fuel Additives

grindinglarrypro said:

What is a good fuel treatment to get rid of water in the gas tank.

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Remove the tank, drain water, replace tank. Snake oils increase the profits for Snake oil salesmen and only work on snake infestations.........

Re: Fuel Additives

HT32BSX115 said:

Remove the tank, drain water, replace tank. Snake oils increase the profits for Snake oil salesmen and only work on snake infestations.........

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Hopefully Larry's tank is easier to remove than mine. It would take some serious demo to get mine out. I used a pump to get the bad fuel out of mine but it wasn't 100%. I'm sure there is still crud in it. I raised the pickup 1/2" for piece of mind. 71 gallon tank.

Re: Fuel Additives

If I had that problem, I would remove the fuel gage sender and use a siphon hose to "vacuum" the tank out a few times

Re: Fuel Additives

HT32BSX115 said:

If I had that problem, I would remove the fuel gage sender and use a siphon hose to "vacuum" the tank out a few times

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That is what I did with the tongue cranked way up, but hard to get it completely dry and spotless. Was moving the hose port to starboard and tried to get all that I could.

Not sure how long Larry's fuel has been in the tank, so more info might help us help him.

Looking forward to seeing more of that truck project Rick.

Re: Fuel Additives

mzahn said:

That is what I did with the tongue cranked way up, but hard to get it completely dry and spotless. Was moving the hose port to starboard and tried to get all that I could.

Not sure how long Larry's fuel has been in the tank, so more info might help us help him.

Looking forward to seeing more of that truck project Rick.

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Having problems when decelerating. Engine speed fluctuates up and down and i think the #7 cylinder has a fouled plug. When i first start and accelerated it was running good was at 4200 rpm in smooth water on the Hudson River then i encountered a lot of boat traffic and waves and that is when the engine lost power upon deceleration. I was thinking it could be a problem with water in the gas. Just bought boat and it had a quarter tank in it and since have run about 25 gallins of 93 octane . I see there is deceleration valve on the engine or could the accelerator pump not be adjusted right. Plan on doing acompression test tomorrow. Any help would be appreciated

Re: Fuel Additives

grindinglarrypro said:

Having problems when decelerating. Engine speed fluctuates up and down and i think the #7 cylinder has a fouled plug. When i first start and accelerated it was running good was at 4200 rpm in smooth water on the Hudson River then i encountered a lot of boat traffic and waves and that is when the engine lost power upon deceleration. I was thinking it could be a problem with water in the gas. Just bought boat and it had a quarter tank in it and since have run about 25 gallins of 93 octane . I see there is deceleration valve on the engine or could the accelerator pump not be adjusted right. Plan on doing acompression test tomorrow. Any help would be appreciated

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When I first read you post I was thinking moisture in fuel, didn't pay attention to the words water in gas tank. You need to do what HT32BSX115 said and get the tank clean.

Re: Fuel Additives

mzahn said:

When I first read you post I was thinking moisture in fuel, didn't pay attention to the words water in gas tank. You need to do what HT32BSX115 said and get the tank clean.

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Yeah. I did exactly what you did with the 44 gallon tank in my Four Winns Liberator.

I jacked the tongue up, removed the gage sender (which opens a hole in the tank about 2-3 inches in diameter.

Then I filled a clear 3/4" 20' long piece of clear vinyl tubing with gasoline, put a ball valve on the end of it and capped the other end.

If the hose is long enough, you can use it to start a siphon in the gage hole.

The thick vinyl tubing is usually stiff enough to slide the end around in the bottom of the tank like a vacuum. If it doesn't cooperate, you can put a 2ft piece of PVC on the end of the tubing and use it like a vacuum tube in the bottom of the tank.

The lower below the bottom of the boat you can get the drain-end of the hose, the stronger the suction. You're just limited by the length of the hose and how far you can put the drain receptacle down the side of a hill.


Start with the tank, fuel pick-up screen(in the tank) , anti-siphon check valve, fuel filter, fuel pump, fuel lines and finally the carburetor.