Topic: 2 line pressure tank – Antique Outboard Motor Club,Inc

This topic has 12 replies, 5 voices, and was last updated 6 years, 6 months ago by snaggerbob.

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October 11, 2017 at 1:16 pm #8441
snaggerbob
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Good morning to all and thanks for providing a great site. I have a Cruise a Day Jr. 2 line pressure tank that I picked up at a flea market that will not keep pressure. I took it apart to investigate. I replaced the diaphram and cork gasket. When I looked at a diagram of the tank I noticed there seemed to be a part missing. It is called a disc valve and it seems to cover the smaller hole in the rubber diaphram. I found the part and it will be here in a couple days. I’m not sure how it will fit or even what it’s functon is. The tank is in really nice condition so I hope this fixes the problem. Any input on this subject would be appreciated.
October 11, 2017 at 6:41 pm #66067
garry-in-michigan
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Lifetime Member
It works in conjunction with the ball valve in the fuel tank foot to ensure the fuel flows toward the outboard when the primer is pushed. . . 😀
October 11, 2017 at 6:47 pm #66068
garry-in-michigan
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Lifetime Member
Later models with the plastic button used a different diaphram. . . 😉
October 11, 2017 at 7:27 pm #66071
snaggerbob
Participant
The parts list shows 2 disc valves. I only have one coming. Do they just sit on the diaphram? Thanks for help again Garry.
October 11, 2017 at 8:16 pm #66073
garry-in-michigan
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Lifetime Member
The spring loaded metal washer backed rubber pressure relief valve is necessary for the tank to pressurize. The smaller disk valve keeps the fuel from just sloshing back and forth in the line when the primer is pushed. Of course the ball valve in the foot keeps fuel from draining out of the foot tube and back into the tank. They should be centered so they, including the ball in the foot, are free to move after the tank top is assembled. . . 🙂
October 11, 2017 at 8:20 pm #66074
frankr
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US Member
There is only one disc valve that you can see. The other one is inside the pick-up tube, just above the screen.

The one that you can see sits in a recess in the housing at the area of the fuel-out nipple. It just lies loose in there, seeming doing nothing, but it indeed does keep the fuel moving in one direction.
October 11, 2017 at 8:48 pm #66075
Dave Hostetter
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US Member - 2 Years
Anybody have a diagram for a Mercury pressure tank from 1953? I have one to recondition. Thanks.

Dave H
October 11, 2017 at 9:47 pm #66076
jerry-ahrens
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US Member
After you get the tank back together, you can pressure test it by using an air blow gun inserted into the ”air” line of the dual hose. Only give it a shot or two of air, (a couple pounds) then use some soapy water or Windex to check the tank top assembly for leaks.
There should be none. Don’t forget the fuel connector O-rings. They are also replaceable if need be.
October 11, 2017 at 9:58 pm #66077
frankr
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US Member
October 12, 2017 at 2:31 pm #66100
snaggerbob
Participant
Now I’m looking at the first diagram again and noticed the diaphram has 3 circle holes and a square for the sight glass. The diaphram I removed only had 2 circle cutouts on the diaphram. The new one,which I made from a pattern of the old one, has 2 circle cutouts. Do I have the wrong diaphram? The second diagram has a picture of the diaphram I have. Do I need to cut out another hole? I need to figure out how to post some pictures.
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