i have a similar problem with my 98 s.a.s. with 89 steering box and have burned up 3 ps pumps, replaced the steering box and made new high and low pressure lines. the lines are not hooked up backwards. when a new pump is installed it works for 5 minutes and then its done. please help or any advice is appreciated. is there a pressure difference or something to do with the original rack and pinion steering.