what stops the fuel while uphill parking

[TomInCologne]

Okay, i admit that i am struggling with setting up my carburettor. This question keeping me awake during the night:


What stops the fuel from flowing out of the main jet when the car is parked uphill?


Let's assume the float valve is working fine and the float level is perfect. When the engine is off, the orifice of the main jet is a bit higher that the float level so fuel does not flow out. But what if the car is standing uphill? Will the orifice then not be lower than the float level?


Where is my intellectual know?


Thanks in advance...