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depend on how much fuel is still in the line
But as far as I know, fuel pump is active when you put the key at on, it's the injectors that does not work if the engine is not turning
Sorry, but you are wrong. The fuel pump will turn off if the key is ON but the engine is not spinning. This is a safety feature. You don't want the fuel pump spewing gas if you're in an accident and the engine gets hit and ruptures a fuel line.
Also, there is a +B and Fp in the check connector. You have to jump these and turn the key to ON to get the fuel pump to run with engine off. This is used to diagnosis the fuel pump and related issues. If simply turning the key to ON worked there'd be no reason for the +B/Fp.
1990 Corolla DX sedan, 4A-FE, 3-speed auto A131L
228,000 miles and counting...
1997 Corolla DX sedan, 7A-FE, 4-speed auto A245E