Evinrude fuel tank with two pipes air and fuel

[kieronriley]

I'm just going through my workshop and I've found(not really lost but) an Evinrude fuel tank with two pipes coming from the tank ne marked air and one fuel , it doesn't have a fuel pump bulb on it. i have never seen one of these anywhere else so i know its standard but does anyone what what exactly it is for and is it worth advertising it or is it so out of date that nobody would be interested in it. i would really like to know something about it as i have for years now just pushed it to the back of the workshop for years now, but lockdown is a great time to tidy and discover things, thanks. Kieron

 

[CLB]

its not an oil tank for the oil injection system is it? A picture would be useful

 

[VicS]

I'm just going through my workshop and I've found(not really lost but) an Evinrude fuel tank with two pipes coming from the tank ne marked air and one fuel , it doesn't have a fuel pump bulb on it. i have never seen one of these anywhere else so i know its standard but does anyone what what exactly it is for and is it worth advertising it or is it so out of date that nobody would be interested in it. i would really like to know something about it as i have for years now just pushed it to the back of the workshop for years now, but lockdown is a great time to tidy and discover things, thanks. Kieron

It is an old two line fuel tank. Instead of pumping fuel from the tank it is pressurised by the engine

Must date from about 1958 or earlier

Well worth advertising if you don't need it. If an antique outboard enthusiast needs one for an old Johnson or Evinrude he will pay good money for it.

http://www.marineengine.com/parts/evinrude-johnson-parts-diagrams/JOHNSON/377512-FUEL-TANK-GROUP.gif

 

[kieronriley]

Good afternoon all ,thanks very much VicS ,i certainly would not have thought it was that old ,but i can se how that would work ,so if its the pressure from the crankcase i can se how that would work when the engine was running, so it must then i suppose produce enough pressure just from the starter pull cord to send the petrol to the carb, sounds really good . Have you any idea why they stopped using this system, thanks again. Kieron
(and thanks for the info on selling it) i will give it a wipe over with an oily rag and the i,ll photograph it

 

[Skipper_Christoph]

Reasons for stopping using the system: It is dangerous to have a container full of combustibles that is pressurized. Only a spark is needed to blow up the whole boat.

 

[VicS]

Good afternoon all ,thanks very much VicS ,i certainly would not have thought it was that old ,but i can se how that would work ,so if its the pressure from the crankcase i can se how that would work when the engine was running, so it must then i suppose produce enough pressure just from the starter pull cord to send the petrol to the carb, sounds really good . Have you any idea why they stopped using this system, thanks again. Kieron
(and thanks for the info on selling it) i will give it a wipe over with an oily rag and the i,ll photograph it

It could be a replacement so may not actually be that old ( many parts are still available)

It is initially pressurised by a built in pump operated by a button on the top of the tank (#24 in the diagram)

They were discontinued from 1959 because of the obvious dangers . Motors equipped with the dual line system could be converted to a single line and fuel pump system but an enthusiast restoring an old motor would want to restore the old dual line system