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I may be mistaken, but on the past 3 Toyotas I have had, the fuel pump does not get power until the engine is turned over (i.e. when it is cranking). Therefore, leaving it turned into the "ON" position does absolutely nothing. I'm sure GM and other brands are different, but on my Land Cruiser, the fuel pump wouldn't pump until you started to crank the engine. So it won't even prime the fuel system. Also, the fuel lines don't lose pressure when the engine is turned off unless the fuel line is cut. Just my $0.02
 
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