Those tanks are getting scarce and good working ones that aren’t rusty inside are scarcer, but they are out there. Sometimes the tank is worth more than a motor that may come with it. The good news is that parts to rebuild them are still made. Good dual gasline is made by Sierra Marine, also sold by NAPA auto stores – both call it #18-8051. Some places make you buy a 50 foot roll and others will sell it by the foot.
https://www.iboats.com/shop/sierra-twin-fuel-line-hose-50-18-8051.html
Here is one that needs rebuilding -(probably diaphragm, gasket and line) that is reasonably priced,but the primer button may be broken off – I don’t see it sticking up:
https://www.ebay.com/itm/VINTAGE-EVINRUDE-CRUIS-a-DAY-DUAL-LINE-PRESSURE-OUTBOARD-FUEL-TANK-CLEAN-INSIDE/113180012707?hash=item1a5a0df0a3%3Ag%3ABLQAAOSwkXRbYmgq%3Asc%3AUPSGround%2155415%21US%21-1&_sacat=0&_nkw=%27pressure+dual+line+gas+tank%27&_from=R40&rt=nc&LH_TitleDesc=0
Here’s one in Minnesota that looks to be a 1955-56 because of the metal primer button:
https://brainerd.craigslist.org/bpo/d/old-johnson-ob-pressurized/6608063507.html
You can post a "Wanted" ad here on our classified board and someone near you will likely have one. Be sure it has the connector on the end of the hose.
They were made in 4 and 6 gallon versions. Note that the replacement diaphragm if needed varies with the year of the tank.
Another option is to add a fuel pump and change the connector on the motor and then you can use any single line tank. If interested, people here can recommend available aftermarket fuel pumps, and tell you how to convert.
What year and HP Johnson do you have? The dual line tanks were last used in 1958. Different year tanks will work with all motors that need the dual line tank. If you have a 18 to 35 HP motor, you will want the 6 gallon tank.
Dave
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