Topic: Johnson SD-15 with Pressurized with Integral Tank?

This topic has 19 replies, 7 voices, and was last updated 7 years, 1 month ago by fisherman6.

Viewing 10 posts - 1 through 10 (of 20 total)

1 2 →

Author

Posts
March 9, 2017 at 5:42 pm #6497
Buccaneer
Participant
US Member - 1 Year (includes $3 online payment fee)
Some where I read something the other day about a Johnson SD-15
outboard with a "pressurized" integral tank.
I tried researching but found nothing but some YouTube videos
of said outboard running. While the styling was a little different,
I seen nothing mentioned about the tanks being pressurized.
Were the tanks pressurized? If not, is there different models
that are, and if so, "why"?
Thanks.

Prepare to be boarded!
March 9, 2017 at 6:10 pm #54045
fisherman6
Participant
US Member - 2 Years
Buc,
Yes, the SD-15 does indeed have an integral pressurized fuel tank. This was done because much of the fuel tank’s capacity sits below the level of the carburetor. Without a fuel pump or the pressure system, that capacity would have been unusable. With the subsequent model SD-20, the pressurized remote fuel tank began.
-Ben

OldJohnnyRude on YouTube
March 9, 2017 at 6:44 pm #54047
david-bartlett
Participant
+1 on what Ben said. Liquids do not like to flow uphill.
March 9, 2017 at 7:19 pm #54052
garry-in-michigan
Participant
Lifetime Member
The low speed carburetor Venturi ran off a small rotary valve in the center main bearing. They tapped into the back side to get the pressure. . . 😆
March 10, 2017 at 1:06 am #54059
Buccaneer
Participant
US Member - 1 Year (includes $3 online payment fee)
Thanks for the replies. From you Youtube videos I could not see the
carburetor, nor where the bottom of the tank was. Make sense now.
Found a tank on EBay. They do indeed look "deeper" than normal,
and see how the tank bottom could be below the carb.
Funny about the "back side" pressure Garry!

Attachments:

Prepare to be boarded!
March 10, 2017 at 1:48 am #54060
seakaye12
Participant
US Member - 1 Year (includes $3 online payment fee)
Well….what do you know! I saw one of those at Tomahawk this past summer and was puzzling over what motor it was from. Different enough to stand out….and I don’t think the seller knew what it was either.

Thanks for the picture.
March 10, 2017 at 1:51 am #54061
jerry-ahrens
Participant
US Member - 1 Year (includes $3 online payment fee)
I have an SD10 if I can find a picture… here you go..

Attachments:
March 10, 2017 at 1:54 am #54062
jerry-ahrens
Participant
US Member - 1 Year (includes $3 online payment fee)
You can make out the ”ventless fuel cap in this picture.

Attachments:
March 10, 2017 at 1:56 am #54063
jerry-ahrens
Participant
US Member - 1 Year (includes $3 online payment fee)
One more of the carburetor..

Attachments:
March 10, 2017 at 1:58 am #54064
fisherman6
Participant
US Member - 2 Years
That’s a sharp looking SD-10 Jerry!
-Ben

OldJohnnyRude on YouTube
Author

Posts