Walbro Universal 450lph In-Tank Fuel Pump High Pressure Version -F90000274

The 274 is the high-pressure version of Walbro's 450 lph in-tank pump, and the distinction from the F90000267 is the only thing that matters when choosing between them: the 274 has a 112 psi relief valve versus 87 psi on the 267, while both flow identically. That higher relief setting is what makes it the right pump for boosted builds running a rising-rate regulator — a 1:1 regulator at 25 psi of boost puts base pressure well past where the 267's valve starts bleeding off.