twin line pressure tank question

[todd281]

I just came into a barn find mile master tank that I plan to restore . the question is once I have it all back together , how much pressure should I use for testing?

[Randy in Tampa]

Todd, I don’t think that they generate more than 2 to 3 pounds of pressure, I’m sure if you tested it 5 pounds it will be fine. Most people pressure test them by pumping them up with the primer button and wait to see if they maintain some degree of pressure ….😎

Rotary valve Johnson’s Rule!

• This reply was modified 6 years, 1 month ago by Randy in Tampa. Reason: Mis spell

[RICHARD A. WHITE]

If memory serves, the “pump” does not pressurize the tank, it merely pushes fuel up to the carb,
The pressure comes from the other line which pushes air from the motor into the tank thereby pressurizing the tank, and pushing fuel to the motor

http://www.richardsoutboardtools.com
classicomctools@gmail.com

[fisherman6]

Richard is correct. The primer button is a liquid pump that pumps fuel to the carburetor bowl. it does not pressurize the tank. Crankcase pressure from the engine running pressurizes it. The fuel pumped into the carburetor float bowl keeps the engine running long enough to generate enough pressure to maintain fuel flow. Pressure will vary from motor to motor but will likely never exceed 5psi. This is often dependent on the condition of the rubber checks in the intake manifold.
-Ben

OldJohnnyRude on YouTube

[todd281]

Thanks for the replies , after reading them I think I should test it to just above 5 PSI . I disassembled it today and think I got a good feel for how it works. Now to get that 60 year old varnish cleaned out of the tank , and get some replacement gaskets.

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