How do I get the fuel into an vintage boat motor that uses a "pressurized" tank w/ double fuel line?

Question

1949 Johnson 10 HP motor. Uses double fuel line and connector. I have both, but can't get the motor running, even though the person we bought it from tested it and it worked. I think the problem is definitely with how we are attempting to get gas from the pressurized (how do we know for sure it's a pressurized tank??--it appears to be) fuel tank into the motor.

Answer 1

all double line connector engines use a pressure type tank. one line is for gas the other for impulses from the motor to pressurize the tank (air line) look closely on the connectors and on the tank they are marked air or fuel do not cross or misplace the lines it will not work. there is a primer button(size of a nickel) on one end or on some tanks near the middle. after you hook up the gas line close the tank lid securely(cant vent to atmosphere as newer ones) push in on the primer button rapidly until it gets hard or you feel resistance. this pressurizes the tank. if in doubt look at the clear filter bowel and watch it fill with gas. then choke and start the engine. if all holds pressure the engine impulses will keep the tank pressurized while running. ensure that the fuel line and connector dont leak particularly at the connector. if this leaks you will need a new one(new orings can be installed in the connector but the brass bushings usually are too worn to keep the oring sealing properly). the connectors are quite expensive so make sure. after the motor is shut off crack open the tank cap carefully and let the pressure out. this will prevent the boat filling with gas if something leaks. leave the cap loose as the sun can and will expand the gas in the tank causing leaks if there are any. this was standard practice for safety. Its also(pressure leaks) the main reason this system was dropped. ps a fuel pump can be adapted to this style motor ask back if interested. good boating! by the way the best way to replace the fuel line is with two equal lines of the same length tie wrapped together or in wire loom. use 3/16 th or 1/4 inside dia line. the new reinforced type. I have used this method in the shop on customers motors and my own ones, works great!!

Answer 2

particular. an entire tank reduces condensation, battling water from entering into your gasoline. make certain to apply a gasoline stabilizer, too. it's going to help boost the widespread of the gasoline because it sits, so as that it's going to no longer degrade too plenty and gum up your injection gadget.

Answer 3

Good answer GMC can't add anything to it.