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The main supply line was fed through the fenderwell, then attached to the regulator with a 90-degree hose end. While it's true that hard-90s should only be used when no other hose end will get the job done, they don't hurt flow much at all. According to Russell, if 90-degree turns were so detrimental, no one would make 90-degree fittings. The truth of the matter is that 90-degree hose ends are produced in massive quantities because they're an essential component of almost every fuel system.