Since this is your freshwater system, and you don't want a failure during cruising, it is worthwhile to carry a spare pump in any case. Therefor, one route
is to purchase
a replacement pump and substitute it in the system. If everything is then OK, you know you had a bad pump and can decide whether or not to attempt a rebuild
, thereby making your spare. If the substution does not solve the problem, you can look elsewhere in the system, with both the water flow and the electrical
supply being candidates. Either way you just bought insurance
against having no freshwater and a big bill for air shipping
a new pump to way-the-heck-out from the United States.