has this ever happened to you ? I purchased the great planes fuel filler for a warbird cowl installation . I have done this at least 4 times before correctly . I added the tank lines , one lines gose to the tank the other to the engine . Another line exits the tank to receice pressure when attached to the muffler .
So I start to fill the tank and has come pouring out the muffler .
So I stop , examine the set up and switch the lines , ok got it correct but it still seems to be under high pressure . If I remove the line going to the engine the pressure from inside the tank forces the fule out at a very fast rate ???Does this seem normal ?

I ran the engine and it runs excellant so I feel the set up is now complete but I am thinking my other planes did not seem to have this internal high pressure when the engine was 1)not operating and 2) I was not filling the tank ?