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The stock fuel pump put out about 40 psi, not enough to hang with big boost numbers, so Vortech supplied an auxiliary pump with the kit. The Vortech pump is rated at 155 gph and mounted inline between the hard line that goes to the tank and the fitting before the fuel rail. For some reason, the fuel line in the kit was 5/16 inch instead of 3/8 inch. So, we went to the parts store for the hose that fits between the pump and the hard line from the fuel rail that is joined by the 3/8-hose mender.