Published Aug 03, 2021
Any sediment or water in the fuel will have settled out during lay-up so it’s worthwhile draining a sample from the bottom of the fuel tank, if this is possible.
Abnormal water in the tank may indicate a leaking deck fill cap, maybe from a missing or damaged O-ring.
Growth of HUM (Hydrocarbon utilising microorganisms) is generally not a problem in colder climates, but can grow with alarming speed in hotter regions.
Read more: https://www.yachtingmonthly.com/gear/9-boat-engine-checks-for-a-trouble-free-season-79509