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On my truck, like most if not all vehicles, the fuel pump is on a separate circuit from the fuel injectors. Cutting the injectors leaves the fuel pump running. The engine fires instantly on a bump start.
Cutting ignition squirts raw fuel into the engine while the engine is spinning down. This does bad things to the oil film on the cylinder walls. My engine takes a full two seconds to spin down from 2000 RPM. That's about 33 revolutions during which fuel is being injected but not burned.
If you cut the fuel pump, you can expect some poor running while the fuel pressure drops.
Somebody told be a story years ago about tow starting a 1960's Cadillac. The Cadillac driver neglected to turn the ignition at first. When he did turn it on, the fuel in the exhaust system went BOOM and blew open three of the four mufflers.
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