need help with (fuel?) problem

[MrKnowitall]

It's always a good idea to change everything all at the same time so when the engine won't start you won't have a clue where to begin.

 

[PaulK]

oh, you're saying the air sneaks through the space that's the width of the metal gasket?
I guess. Not a very direct path but if that's the way it usually works I'm not the one to question it.
Back to square one I guess.
I'll check the plastic insulator, like McKutzy suggested.