Turbine style compressor fuel pumps which may be used with a return or returnless style fuel system. When tested at 3 bar/44psi and 13.5V, these pumps flowed 346lph. Under the same conditions, Ford GT pumps flowed 250lph. That’s an increase of almost 40%! They are identical in dimensions to Walbro GSS341 pumps and will work well in a stock fuel hat or an aftermarket hat designed for Walbro pumps.