I had a very similar problem, air was getting in to the fuel line if I parked facing up hill it solved the problem. Eventually the real cause became apparent and fuel leaked out of the metal fuel line under the car. I had to drop the sub frame to get access to the leak and patch it, I also replaced the clutch, dmf and crank seal.
Check the fuel lines for air bubbles, read up about how to bleed the fuel system - it drove me mad until I bought a simple inline hand pump.
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