fuel pressure dropping over time

RustyRatRod said

A factory return system with a .060" metered orifice will return ALL of the fuel to the tank. It might take a while. lol

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If it takes any longer than the combined amount of time it takes to get it there minus what the engine is using then it will create pressure rise and the .060 is too small. If it doesn’t, it’s not. It’s that simple.