2001 250 ox66 , Gunk in fuel

[bitesomthing]

Its me again, i just got the boat out of shop, they told me they found gunk on the high pressure fuel pump screen. Cleaned it and say it runs good again. I have not tested it on the water yet. my question is they said it had a white gooey gunk on it. I have heard that this white gooey gunk is not good.
I have a aluminum tank and am wondering what causes it and how to remedy this problem. I do not feel safe heading out 60 miles in this condition. What do you think are my options? Does this mean tank replacement???? Just a fuel polishing?
Thanks
Chris

[boats.net]

Water in fuel tank can cause a gel. The new 10 micron water/fuel separating filters is the best way to keep water and trash out of your fuel injection system.

[bitesomthing]

i am using a 10 micron filter and still getting the stuff on the VST FILTER. I need to find the cause so it can be fixed.