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Not talking about a diesel.
Ahh, I get that if you run out of fuel, the air in the line would prevent fuel / make for hard starting.
But that would clear would it not? Injector opens, air goes into engine, repeat, repeat, fuel reaches injectors.
Vapors are controlled by the EVAP emissions already (which a return and returnless system both have). It wouldn't be a bomb as the vapours would still vent (through EVAP to atmosphere apparently).
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