Catalina 470 Owners Association


Tanks, Senders and Hatches on Voyager #11

If you change from the sender that is recessed down into the tank to one that is mounted on the top of the tank you will get correct readings as to when your tank is full. The diagram shows you why this doesn’t happen with the recessed sender.

Go to to find replacement senders. The stainless steel screw thread type is a model S3U, you do not need a thread adapter kit, the unit will screw directly into the old threads. If you wish to mount the senders in the top of the tank use the SSL or SSS stainless steel units. In both cases you need to select a sender length. If you opt for placing the unit on top of the tank get a gasket for the sender from Wema. To install you need a hole saw large enough to allow the float to go nito the tank. After that all you need are 5 stainless sheet metal screws to hold mount the unit.

Tank #1 showing sender position if you want to install a full height sender as opposed to the one that is recessed below the top of the tank you may do so just to the right or just in front of the original one. The full height unit uses 5 screws to hold it down. By using the full height unit you will get correct readings as to when the tank is full. Both this photo and the one below were taking before I changed to the top mounted senders.

Tank #4 under the galley sole; you can also replace this sender with a full height unit

This is where tank #4 used to reside. It is now a storage area that measures 54′ long by 26″ wide and ranges 6″ to 13″ in depth. Long neck beer bottles will stand up under the forward hatch.

Above is the galley sole now with two hatches to access the storage areas

Tank #5 – located in the companionway between the stairs sand aft head – at a capacity of just 15 gallons means it always runs out when you are in the shower covered in soap! A wine cellar seems like a much better solution, also you can add an additional sump pump to help drain the aft shower It also helps if you add an additional drain to the outboard side of the shower drain pan, for those times you are on port tack.


I replaced the #2 watertank with a factory supplied aluminum fuel tank. To the right is a closeup of the tank sender, fuel feed and return. This is the same sender you can mount in the top of your water tanks. Below is an overall photo of the tank installation, the large opening with the small hose sticking out is where the new 16k airconditioner is being installed.

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