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Thanks to all so far for great information. Interesting that so far no one has posted experience of removing tank through the hull. Maybe that is not as cost effective?

Has anyone completed this repair by removing the side of the hull and replacing the tank in that manner without removing the engine? Is that more or less cost effective?

Wow - a picture says a thousand words. They really cleaned out the entire space and got those new tanks in. Not sure if you could get one of your new tanks in if you only had one engine removed. Since I am on the Cheseapeak Bay on the West River - I would like to know who did your work so I...

Skipjack - Thanks for this information! How bad was it to remove the engine on the starboard side? What else did you have to do or remove to get access to the tank to cut it in half and get it out? And get your two smaller tanks back in place? Did you remove both engines and replace both...

I recently discovered that my starboard tank has a slow leak. I have not read much in this forum of folks having problems with the aluminum tanks in the 400. Has anyone had a leaking tank? What was the cause? Looks like this is very difficult to remove and replace. Has anyone had to replace...

I want to thank all of you for the guidance and good ideas. And thanks to dougcole for the link to a past thread on this subject. Guess all I got to do now is just go do it! Thanks Butch

I have Yanmar 4LHA 240hp engines.

On my 2007 Mainship 400 the impeller on the port engine is almost impossible to get to. Anyone figured out the best approach or any special tools to get to it? Thanks