Reply To: Mid fifties pressure tank rebuild problem

[JohnRude]

Interesting. I never realised that was how it worked. I did know that the crankcase is pushing air back to the tank.

Now that I think of it the push button is over the fuel intake pipe that pulls from the bottom of the tank. Thanks. So it’s the pressure coming back from the crankcase that is blowing past something to force fuel out around the button. It’s a mechanical problem not a membrane problem. As Crosbyman says, “it pays to be a member”.