Just to be clear - my post about my high pressure pump wasn't meant as a cure for your pulsing or mine as I have an accumulator tank. My pump either needed rebuilding or replaceing and I chose replaceing. I just wanted to share my self-generated problem in case someone does need or wants to replace a pump with something other than the one that came with the boat.
Stan, I too should have been more clear. My response was in reply to the OP's statement "I want to install a 4.5-5 gpm pump to reduce the pulsation". I understood that your post was alerting him to a possible "side effect" of a higher pressure pump. Hopefully with our respective clarifications he'll understand what we were each getting at.