If you kids remember a post a couple of years ago talking about fuel problems on a gen-set. A few of us got carried away and I injected my problems. http://www.yachtforums.com/threads/generator-question.19857/page-4#post-167061 This last fall we were still having the diesel fuel snot problem in the aft tank. I hate snake oils. Tried a few with no results. Last ditch try was Valvetech Micro-Biocide from West Marine. A overdose of a shock treatment and the snot went away. However, when the bow comes up, instead of snot, I get water. I assume the snot was water based. Remember; forward end of tank lower than the aft end. Fuel pickups in the aft of tank. Forward end of tank under bath tub. last forward tank access is the fill adapters, fore & aft from here are internal baffles. My built in fuel polishers use the existing pickups & returns. They work great but can't get to the low end. The original GM primary fuel filter cartridge system was replaced with a Donaldson spin-on with plastic water bowel. Fuel system is now; Dual Racor mud filters 1000s @ 30mic, spin-on primary with water bowel @ 16mic, spin-on secondary/final somewhere between 5 & 10 mic. Trials last Thursday night found some water in the Racors, new secondary bowl had water also. I built my own fuel filter assembly and tried again to reach the water with a copper tube wand. I was able to reach around some of the corner openings in the baffle but all I got was dissolved snot and dirt (more dirt than the $400 fuel polish gut got 2 years ago). What I have learned; Racor 1000s (30 & 10mic) will pass water. Those big white, tan & brown snot blobs were water based. Fiberglass tanks are intact. Bertram 37 year old fuel tank design for service sucks. Looking for a pair of lift bags to set under the bow. Have a nice filter to rent out in the Jax area. Pictures on next post.