Because its loud, expensive, and flows the same or barely more than two Walbro 450, and is blown away by 3 of them. Walbro 267's are under $75 currently, and quiet, don't heat up the fuel excessively, etc.
I spent almost $2000 buying different fuel pumps from summit to test against the walbros. Including this one, brushless pumps, and an Aeromtoive eliminator. All were big, bulky, HEAVY, and NOISEY as fuck. That was before looking at flow numbers, I sent them ALL back, and will never run anything but a 450, or multiple 450's in any build I am doing.
I spent almost $2000 buying different fuel pumps from summit to test against the walbros. Including this one, brushless pumps, and an Aeromtoive eliminator. All were big, bulky, HEAVY, and NOISEY as fuck. That was before looking at flow numbers, I sent them ALL back, and will never run anything but a 450, or multiple 450's in any build I am doing.