We have a A.C.E. 29.3. Had the same problem a while back. Mind you we have had the RV for almost 7 months now and just the other day started to check this out. The dealer said it was normal to have so much pulsating but it hadn't always done that. And now the pressure was dropping off. So I started at the pump to see if it was going out, but found that the inlet filter (clear little round thing upstream of the pump) was clogged with little clear plastic pieces. Removed and cleaned it up and it made a big difference. The water is a bit hotter but it is really hot in the electric mode.
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