Carver Owners Forum

Carver 38 SS - Primary fuel filter displayed algae in the sight glass. We engage a guy to conduct fuel polishing, removed 10 Litres of water from the starboard fuel tank. Started engine and run for 30 minutes, and saw signs of water in the filter sight glass.
I believe the intake incorporates a cooling chamber to retain excess fuel and return to the tank.
Right now we are trying to determine the root cause of the level of water in the fuel tank. Any assistance will be much appreciated.

Welcome aboard!
I'm pretty sure the knowledgeable people here will need to know which engines you have.

Welcome to the forum....judging by your algae comment I will assume you have diesels.

If your guy just used the factory fuel system to pull fuel he may not have gotten to the tank bottom where the water would be for the most part. Sorry can't comment on the fuel cooler you mentioned.

One thing for you to do though, replace the deck fuel fill cap "O" rings with new as a bad seal there can be a major source of water getting into fuel tanks especially if they are on flat section where water can pool. Those rings don't last long and should be considered a yearly maintenance item IMO.

Welcome aboard mate.
Ya I agree with checking the deck fill o-rings. Also, after each fuel fill, I always double check and ensure that dock staff tighten down the deck fill cap with a key. A new seal won't matter if the cap is loose. The other causes would be condensation and where you get your fuel from, though a bad fuel source would likely result in water in both tanks. Is it just the starboard side that has water? Also, don't dismiss the possibility of a dock staff having screwed up and put water in the wrong deck fill. I couldn't tell you how many times I've been called to deal with that or fuel in the water tank.

Hi Bud37,

Appreciate your input. Thanx

We are running with Yanmar turbo diesel engines.

We are running Yanmar 335HP turbo diesel engines. I will be onboard next weekend to assess the actual fuel circuit and replace filler point Orings.