Where is the fuel pump located on a 1993 Mazda Miata?
The fuel pump is located inside the gas tank.
On a '91 Mazda Miata is the fuel pressure regulater located on the supply end of the fuel rail or the return end?
Yes. Both are under the car, just before the rear wheel on the passenger side (assuming LHD cars). It is protected by a plastic splash shield. The fuel filter on the 1997 Mazda Miata is located, under the vehicle, on the passenger side, below the seating area, front of the fuel tank. It is mounted on frame in fuel line.