Have to admit that a few months before I sold the boat I went ahead and put a 24v Walbro in and tapping 24v off the nearby 32v bank. That sort of thing is usually a no-no, but the pump is very low power and only used 3 or 4 times a year total so I could get away with it.
I later found out that Walbro is Ok with the pump running off a 32v feed, again because it is very short use. So I switched it back and could use the nice little switch panel in the other engine room across the hall. I saved the squeeze bulb, which worked great by the way, as a spare for the dinghy motor, where it now resides a few years later. It is much heavier duty than what was on there before.