Built in tanks and gas/oil mix …?

[amuller]

I’ve always used portable tanks with 2-stroke outboards. Built in tanks have gone with 4-cycle engines. Now, I’m setting up a boat with a 2-stroke engine and built in tank. I feel slightly uncomfortable not being able to agitate the tank to ensure an adequate mix. And some people claim the mix can separate in a sitting tank.

Thoughts on this?

Thanks!

• This topic was modified 3 years, 7 months ago by amuller.

[dave-bernard]

rocking of the boat will mix it. if trailered no problem. docked I am sure it will rock enough . just my thoughts. if it bothers you rock the boat at the dock by hand.

[Bob Wight]

I’ve had several boats in the past with built-in tanks and 2-strokes. I always just added oil slowly into the fuel stream as I was filling the tank. Trailering the boat down the road assured adequate agitation. I never had any problem with oil separation while the boat was stored between trips.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1955 Johnson QD-16
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

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[need2fish]

I find the oil to be more viscous in the fall or early spring. This may affect mixing so I keep it in the (heated) garage. Bob’s method works best when the boat is out of the water.

[kerry]

I was always nervous about it, so I put my oil in a gallon gas can and added gas, shake carefully, add to tank, repeat until oil was gone, finish putting correct gallons of gas in tank. Say what you want, that Force 125 ran like a swiss watch when I sold it.

If you have too many, AND not enough, you're a collector.

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