fuel mxing

[jlscjs]

I have a 70hp evinrude 2 cycle with a 20gal tank. I want to know if adding my oil & other additives through the fill tube then adding my gas is a good way to mix it or should I mix in a can and then add to the boat? My concern is will I get the oil and gas mixed well enough by adding separately and driving down the road letting the trip to the water mix it for me.

 

[flyingscott]

I always mixed whatever amt of oil I was going to use with a couple of gallons of gas and poured that in the tank. Then added the rest of the fuel. Most manuals and mixing instructions will tell you that's how to do it.

 

[David Young]

I do mine the same way. I only have 6 gallon tanks but, this way should work on a 20 gallon tank. The gas going into the tank will mix up the oil just fine.

 

[interalian]

It'll mix just fine like that but you'll never have the mix exactly right (if that matters) due to not knowing how much gas is already there. I always mix in a jerrycan then add to the boat tank.

 

[jlscjs]

I always mixed whatever amt of oil I was going to use with a couple of gallons of gas and poured that in the tank. Then added the rest of the fuel. Most manuals and mixing instructions will tell you that's how to do it.

So I could mix up 5 gallons of gas in a can with the amount of oil for 15gal, then go to the station and add my other 10 and this would work fine?

 

[flyingscott]

Yes that would be fine

 

[Chris1956]

If there is some fuel already in the tank, gas and oil mixing is easier than if the tank is dry. For example, if you were to pour a gal of oil into an empty fuel tank, and then pump 50 gal of gas into the tank, the fuel will not be mixed completely for a while. Adding the oil, and then adding the gasoline to a partially filled tank works just fine. It is best to make the mix as close to 50::1 as possible, so if there is any doubt about how much gasoline you need, mix it in increments. To mix in increments: If you think you need 21 gal of gas to fill up, you could toss in 56 oz of oil and then fill it. If your fuel estimate is off by several gallons, which is possible when estimating that amount of fuel, the mix ratio will be off. Alternatively, add 1 qt of oil and then 12 Gal gasoline. If the tank looks at least 6 gal low, add 1 pint of oil and 6 gal of gasoline. If she still looks like she will take 3 gal more, add 8 oz oil and then 3 gal gasoline. This method will help the oil to mix, and help elimate the error in estimating. If you miss it by a gal, it won't be much of an impact.