This is why for inctance even GA prop planes of today featuring injector engines (such as a Cessna 182) have a dedicated fuel pump as well. But what it doesn't do is fetching the fuel from the tank.
It seems most people are not aware that the injector pump (in an "injector engine") does only that, inject fuel into the cylinder. You are using a very simplified view on things, the carburetor is not the only thing affecting how long you can fly inverted, modern stunt planes as in your example use modern fuel pumps, if you invert a 109 or pretty much any other WW2 aircraft for that matter (as far as i'm aware) the fuel pump will not be able to deliver fuel to the engine Is there any reasons of why the Yak's engine (and others equipped with carburetors, except I16 which only hold inverted flight for ~3 seconds) keeps working for 10 seconds under negative Gs? He clearly said the Yak's engine can't support negative G for more than very few seconds. I know someone who fly a Yak9 in Switzerland ( ). I don't know about the 109 with DB600 and 605, but I bet it should be more than 10 seconds. Aerobatics aircraft equipped with injection engine can fly inverted for few minutes. The 109, with injection system, can fly inverted for 10sec, also. In the game, the Yak can fly inverted for 10 seconds, with the MP105 and its carburetor system. I can promise that the engine will seize from fuel starvation WAAAAAY before you suffer any lubrication-issues. That's why there is the (also mentioned in several posts above) buffer/header fuel tank of just a few litres, which is situated between the fuel tanks and the engine, from which fuel can be pumped when being inverted, because it doesn't just have a simple bottom-suction pump. No fuel injection system in the world can keep the engine from starving if there's no fuel to inject to the engine, and WW2 airplanes didn't have a fuel system could feed from the tanks when inverted. As has been mentioned in several posts above it is shuffling fuel from the fuel tanks that's the issue not to portion it appropriately into each combustion chamber.
There are plenty of carburettor-fed engines that can work just fine when inverted. Having fuel injection or not doesn't matter at all for inverted flight. Thats why it was forbiden prolonged inverted flight. Some planes got fuel injection and have no problem with fuel delivery but all these planes didnt have special oil system to keep oil pressure under zero or negative G force. For prolonged inverted flight there is need fuel delivery but also oil pressure special system.
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