Hi Bob, assuming that your rebuilt pump and box are ok, and that your hoses and connections are not leaking, check the short hose coming off of the bottom of the PS fluid reservoir. It takes a sharp turn to get to its attachment to the pump and can be kinked, even if the reservoir is not mal-rotated. This can starve the pump for fluid. I had this tendency on my car and I used a E-Z coil to prevent it.