using my second 75psi pump now in 3 weeks, keeps burning the switches out, was told to put a return on the tank and still its gone pear shaped, what the hell am i doing wrong? can someone tell me, the return is set to keep the pump working full time as i was told that these pumps are not designed to start and stop all the time, but still it keeps burning the switch out, anyone have an explanation for me coz i'm beginning to think this was not a good investment, my customers are going to go mental this time, put them all back 2 weeks when it happened last time, i am going to go mad and smash the thing up, please please please help me