electric fuel pump


are many using an electric fuel pump on cruise vehicles as opposed to the higher restorations?  if so, I have heard that the 3-5 PSI shut off units are necessary rather than the 5-8 PSI units.  is this true because of the carburetor and engine size or an old wives tale?  the lower pressure ones are found on E Bay but with shipping run about twice the price.  appreciate any answers/thoughts,    Paul Rinehart

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