No, but some are reversible. Probably only a few 1/1000’s will cause an issue. I’ve had both of these issues, and both sounded like the original post. Basically, the pump looses its priming and sucks air until it gets enough suction with the higher revs. The side plates, I replaced them. The shaft seals, I got a whole new pump assembly for a Yanmar 2 banger for around $200. I figured labor to replace the seals would have been way higher than that! Took me 15 minutes to switch it out, and I was happily on my way. Lasted the rest of my time on the boat.