It's an 8 1/2 gpm pump I can take the pulley measurements and I'm sure someone on here can do the calculations to find exact psi at 27.5 hp at 3200 rpms I think the pulley sizes are4 1/2 on the motor and 7 1/2 on pump. The pullys have a stainless steel cover and it has a 20 gallon stainless fuel tank