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don't think you'll gain much if any by running the higher pressure. GM did it because they started running returnless fuel systems (or at least they didn't return from the engine compartment, and the higher pressure helped against possible vapor lock issues in the steel fuel rails.
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Thanks, Jody. I've heard that from others too. The car runs fine, makes great power, but has this annoying cold start issue. I was hoping better fuel atomization might help it.
But 60 psi sure didn't have the effect I thought it would, lol.